88 objets du quotidien avec des fonctions secrètes

Sympa

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Transcript

00:00:00So you're hungry, but you don't really want to make a very flat dessert meal.

00:00:05What would you say about instant noodles instead?

00:00:08At the end, your stomach is growling, but there's a problem.

00:00:12The polystyrene cup is broken and the noodles are outside.

00:00:16Wait, what's this space at the bottom of the cup?

00:00:19But why?

00:00:21This space is intended to protect the noodles.

00:00:23It's not the company that's trying to save money or anything like that.

00:00:27Notice how the ramen in the cups is almost never broken,

00:00:31while the one in the packet comes out in bad shape.

00:00:34This technique is called an intermediate suspension.

00:00:37The noodles are tightened to prevent them from being crushed in the delivery truck.

00:00:41It's not just to make the noodles look beautiful and long.

00:00:45It's also about making sure that these delicious noodles are softer and more regular.

00:00:50Morning wool is not the best.

00:00:53Fortunately, there is an easy way to get rid of it.

00:00:56Of course, everyone thinks that mouthwash was invented to...

00:01:00wash your mouth.

00:01:02Well, no.

00:01:03Mouthwash was originally invented and sold as a floor cleaner.

00:01:07It was sold to hospitals as an antiseptic for years,

00:01:11but it never really took off.

00:01:14A genius in marketing renamed it mouthwash.

00:01:17The rest is a fresh story.

00:01:20So, after cleaning your teeth,

00:01:22don't forget that, sometimes,

00:01:24repositioning a brand can be very effective.

00:01:28It's hard to imagine a world without the Internet these days.

00:01:32No streaming, no online games,

00:01:34no pictures of cute kittens.

00:01:36Yes, I know that's not why it was designed,

00:01:39but who cares, right?

00:01:41The Internet prototype was called ARPANET,

00:01:44acronym for Advanced Research Projects Agency Network.

00:01:51This machine was very sensitive.

00:01:53To prevent anyone from turning it off,

00:01:55an intelligent scientist glued a piece of paper on it

00:01:58with its striking words.

00:02:00This machine is a server.

00:02:02Don't turn it off.

00:02:03It was written in red ink,

00:02:05nicely drawn.

00:02:07The fact that your teacher scribbles in the margins of your notebook

00:02:10is not really new.

00:02:11Except that the margins were not designed for that.

00:02:14It's a protection against rats.

00:02:16At the time, rats were constantly nibbling on paper.

00:02:19So if you wrote something on the edge of the sheet,

00:02:22it would end up in the stomach of a hungry rat.

00:02:26A few well-placed margins

00:02:28prevented your best answers from being eaten.

00:02:31I can't finish this pizza.

00:02:33It's time to cover up the leftovers.

00:02:35Fortunately, I have a lot of plastic film.

00:02:38A little pull, and the roll comes off.

00:02:41Cool!

00:02:42If you look at the packaging,

00:02:44this long and thin box,

00:02:46there is a small detail that can help.

00:02:49A cardboard tab at each end.

00:02:51Push them inwards,

00:02:53and the roll will no longer be able to move.

00:02:55It's strange that I've never seen them before.

00:02:58It's lunchtime.

00:03:00I feel like a Californian today.

00:03:02Algae, rice, cucumbers, avocados, and crab meat.

00:03:06Or is it...

00:03:07In fact, it's imitation crab meat.

00:03:10It's basically cheap white fish

00:03:12mixed with sugar.

00:03:14The fish mixture is then heated and shaped.

00:03:17It's delicious.

00:03:19Maybe that's why it's called

00:03:21the hot dog of the sea.

00:03:23No, I just made that up.

00:03:27Your microwave has a secret that we've all seen,

00:03:30but we've never paid attention to.

00:03:32This black net you see on the door

00:03:34is a Faraday cage.

00:03:36It prevents electromagnetic energy,

00:03:38or microwaves, from escaping

00:03:40and cooking you at the same time.

00:03:43That's how it heats up food so quickly.

00:03:46Each microwave has to have one,

00:03:48and they're all of different qualities.

00:03:50This Faraday cage can even stop

00:03:52the signals on your phone,

00:03:54which is certainly useful.

00:03:56Hey, you don't need your popcorn

00:03:58to stop swelling to make a call, do you?

00:04:01For that, airplane mode is much easier to handle.

00:04:04Have you ever passed a IQ test

00:04:06and realized you had Einstein's IQ?

00:04:09No? Me neither.

00:04:11The average IQ is not 100,

00:04:13and there is very little evidence

00:04:15that Einstein ever passed the test.

00:04:17At first, most people thought

00:04:19that the tests were too vague

00:04:21to be used for anything.

00:04:23This test was designed for children

00:04:25who needed help with their studies.

00:04:27Later, they realized they could be adapted

00:04:29to measure intelligence,

00:04:31but originally, they didn't aim for that goal.

00:04:34Hey, you've never blown up bubble wrap?

00:04:37No? You're missing something.

00:04:40And of course, you guessed it,

00:04:42it was never designed to be blown up

00:04:44or used as we do today.

00:04:46It was invented as a new textured bubble wrap.

00:04:49It was by sealing two shower curtains together

00:04:52that they created the first bubbles.

00:04:54The idea was never really found by the public.

00:04:57After failing as a bubble wrap,

00:04:59it discovered the true meaning of life.

00:05:02This bubble wrap could protect fragile objects.

00:05:05When the first computers were shipped,

00:05:08bubble wrap was there to protect them.

00:05:11Would you find that cool or not?

00:05:13Leave me a comment below.

00:05:15If you owned one of the biggest companies in the world

00:05:18that sells one of the most famous products on the planet,

00:05:21how would you keep the secret of your company?

00:05:24A secret?

00:05:25The Coca-Cola formula is not even patented.

00:05:27The first recipe was,

00:05:29but when they made changes,

00:05:31no patent has ever been filed.

00:05:33The secret formula is only known

00:05:35to a few people in the company.

00:05:37That said, even the rival of Coca-Cola

00:05:39doesn't want this recipe.

00:05:41In 2006, an unhappy employee

00:05:43tried to sell the secret,

00:05:45but he couldn't find a buyer.

00:05:47Hey, look at your brand new mattress.

00:05:50See the label?

00:05:51Don't take it off under legal proceedings.

00:05:54This thing looks pretty serious.

00:05:56But good news,

00:05:57the labels are not for you.

00:05:59They are intended for mattress sellers.

00:06:01100 years ago, mattress manufacturers

00:06:04created the filling with practically anything.

00:06:07Animal fur, hospital beds,

00:06:09or even clothes.

00:06:11Then, strict laws

00:06:13prevented the use of these weird materials.

00:06:16Hospital mattresses were thus filled with germs.

00:06:19Yuck!

00:06:21In the rainy season,

00:06:22the water-filled modeling paste

00:06:24is great for taking care of the house.

00:06:26Mix flour, water, salt, food coloring,

00:06:29and that's it.

00:06:31Any creative person

00:06:33can have fun with it for hours.

00:06:35Good price, clean, non-toxic,

00:06:38the perfect modeling paste.

00:06:40But it was never designed for that.

00:06:42This product was originally

00:06:44intended to clean the walls in the 1930s.

00:06:47It's because people started going crazy

00:06:49with the wallpaper

00:06:50on which they couldn't use water and soap.

00:06:53In the end,

00:06:54Pledo found new functions

00:06:56and did really well.

00:06:59Have you ever finished a sock

00:07:01and noticed a hole in the little stick?

00:07:03This hole isn't just decorative.

00:07:05And no, it wasn't designed

00:07:07to turn into a musical instrument.

00:07:09It's there to prevent

00:07:11this delicious sweet treat from falling.

00:07:13When the candy is still hot,

00:07:15it's poured into a mold.

00:07:17The candy flows into the hole

00:07:19and hardens, creating an anchor.

00:07:21You don't like socks?

00:07:23Then why not some good old rubber bear?

00:07:27Unfortunately,

00:07:28they're not American at all.

00:07:30They're German.

00:07:32A German company started making them in 1922.

00:07:35The original name was...

00:07:37Gummi... something.

00:07:39In short,

00:07:40they were inspired by real bears

00:07:42dancing in shows.

00:07:44These treats ended up going around the world.

00:07:47Have you ever wondered

00:07:49what these little bumps on the F and J keys

00:07:51on your keyboard were for?

00:07:53These little things are there

00:07:55to keep your index finger

00:07:57in the best position possible

00:07:59to tap at lightning speed.

00:08:01Keep your fingers on the F and J keys.

00:08:03This will allow you to reach

00:08:05all the keys more easily,

00:08:07especially if you don't look at the keyboard.

00:08:09Today, everyone loves Slinky.

00:08:11If you've ever seen one

00:08:13dangling down the stairs

00:08:15with groovy music in the background,

00:08:17bravo!

00:08:18You really are a YouTube fan.

00:08:20It was a huge success

00:08:22as soon as it came out.

00:08:24In fact, it was never designed

00:08:26as a toy at all.

00:08:28It's a spring.

00:08:30It was originally designed

00:08:32to stabilize the ship's

00:08:34sensitive nautical devices.

00:08:36So it's not a fun feature at all.

00:08:38And yet, one day,

00:08:40one of them fell off a table

00:08:42and danced right into our hearts.

00:08:44After many experiments,

00:08:46the improved Slinky was born.

00:08:48Let's give this team of scientists

00:08:50a medal.

00:08:52It was originally designed

00:08:54to store your pocket watch.

00:08:56You don't have a watch to put it away?

00:08:58How is that possible?

00:09:00It was a hit in the 1890s.

00:09:02But that's not all

00:09:04that makes your old jean interesting.

00:09:06Look around your pockets.

00:09:08You'll see rivets sticking out.

00:09:10No, it's not a vestige

00:09:12of the fashion of the past.

00:09:14These rivets play a very important role.

00:09:16They protect the sensitive areas

00:09:18of the most worn jeans.

00:09:20Back in the day,

00:09:22most people wore jeans

00:09:24to do tedious manual work,

00:09:26so they had to be resilient.

00:09:28If today, these men saw you

00:09:30paying $100 for a ripped jean,

00:09:32they'd probably faint from shock.

00:09:34It's probably not what you imagine

00:09:36when you think of cashew nuts.

00:09:38But a Reddit member

00:09:40found them like this

00:09:42in a store in Brazil.

00:09:44In fact, they're not real nuts.

00:09:46Cashew nuts grow

00:09:48in the proximity of a cashew apple.

00:09:50There's a special word

00:09:52for a fruit with a seed inside.

00:09:54A drop.

00:09:56So cashew nuts are drops,

00:09:58just like almonds and pistachios.

00:10:00Brazil is the country of cashew nuts.

00:10:02The tree was then brought to India

00:10:04by the Portuguese in the mid-16th century.

00:10:06From there, it spread to Asia

00:10:08and then to West Africa.

00:10:10Today, these regions

00:10:12are the largest cashew nut producers.

00:10:14But the United States

00:10:16is the largest consumer.

00:10:18They import 90% of the world's crops.

00:10:20Speaking of food,

00:10:22here are some interesting facts.

00:10:24Did you know that pineapples grow this way?

00:10:26What's more,

00:10:28they're not part of these fast-growing fruits.

00:10:30It takes them between 16 and 24 months

00:10:32before they can be harvested.

00:10:34Not to mention that a plant

00:10:36can only produce three pineapples

00:10:38at most in its lifetime.

00:10:40Fun fact,

00:10:42each pineapple segment

00:10:44is called an egg.

00:10:46Did you ever wonder

00:10:48why eggplants are called

00:10:50eggplants in English?

00:10:52If you've never seen

00:10:54a growing eggplant,

00:10:56here's a picture.

00:10:58Now you understand.

00:11:00They literally look like eggs.

00:11:02What's more,

00:11:04eggplants are not botanically

00:11:06grown vegetables.

00:11:08They're berries,

00:11:10just like watermelons.

00:11:12You'll never guess what it is.

00:11:14It looks like a bouquet of flowers,

00:11:16but it's broccoli that hasn't been harvested.

00:11:18These flowers are actually edible.

00:11:20Broccoli has been known for at least 2,000 years.

00:11:22It was the Romans' favorite food.

00:11:24But it only appeared in North America

00:11:26in the 1920s.

00:11:28Italian immigrants

00:11:30brought it to California

00:11:32and started selling it.

00:11:34Today, the United States is the third

00:11:36largest producer of broccoli

00:11:38after China and India.

00:11:40What happens to an artichoke

00:11:42if you let it bloom?

00:11:44An artichoke is actually a flower

00:11:46that hasn't had time to bloom.

00:11:48It's also one of the oldest

00:11:50foods humans know.

00:11:52Remember that a pineapple

00:11:54takes about 2 years to produce fruits

00:11:56and that a plant can only

00:11:58bear 3 pineapples in its lifetime?

00:12:00Well, an artichoke plant can grow

00:12:02up to 20 artichokes a year.

00:12:04Artichoke is one of the healthiest

00:12:06vegetables in terms of antioxidants.

00:12:08Artichokes sleep.

00:12:10Many of them sleep inside their carapace

00:12:12to protect themselves from predators.

00:12:14But some artichokes can't

00:12:16retract in their carapace,

00:12:18so they sleep in positions similar to this one.

00:12:20These animals are active during the day

00:12:22and sleep at night.

00:12:24The amount of sleep an artichoke needs

00:12:26depends on the species.

00:12:28It can go from 10 hours to 1 hour.

00:12:30On average, an artichoke

00:12:32takes a nap from 4 to 6 hours.

00:12:34The most important factor for an artichoke

00:12:36when it goes to sleep

00:12:38is to find a safe place.

00:12:40They can hide under leaves

00:12:42or in holes in the ground.

00:12:44Have you ever seen a chameleon's feet?

00:12:46These creatures have two toes

00:12:48on the inside of the foot

00:12:50and three on the outside

00:12:52at the level of the front feet.

00:12:54And it's the opposite for the back feet.

00:12:56Chameleons live on trees

00:12:58and their feet help them climb better.

00:13:00We all know the unique ability

00:13:02of chameleons to change color.

00:13:04But they don't change to hide.

00:13:06In fact, the color depends on the chameleon's mood,

00:13:08temperature, humidity

00:13:10and light.

00:13:12And did you know that some of them

00:13:14have a tongue

00:13:16twice as long as their body?

00:13:18Have you ever seen a walnut's mouth up close?

00:13:20They have teeth inside their beaks.

00:13:22Walnuts are very loyal creatures.

00:13:24It's not a myth

00:13:26that a walnut attaches itself

00:13:28to the first stimulus in motion

00:13:30it sees after the explosion.

00:13:32Whether it's a walnut, a person

00:13:34or even a simple object,

00:13:36it will remain devoted to this creature

00:13:38or to this lucky thing

00:13:40throughout its life.

00:13:42Walnuts also mate for life

00:13:44and are very protective of their offspring.

00:13:46If they lose a loved one,

00:13:48they cry for it.

00:13:50If a walnut from a group gets sick

00:13:52or is injured,

00:13:54two or three stay with it

00:13:56to protect and care for it.

00:13:58This adorable little creature

00:14:00already has about 60 teeth.

00:14:02It's not the DNA

00:14:04that determines the sex of an alligator,

00:14:06it's the temperature.

00:14:08If the eggs were laid

00:14:10when it was hot,

00:14:12bad alligators will hatch.

00:14:14If they stay in colder temperatures,

00:14:16there will be a lot of females.

00:14:18After hatching,

00:14:20it takes 10 years for an alligator

00:14:22to become an adult.

00:14:24In general, alligators live

00:14:26about 35 years in nature.

00:14:28They don't live in salt water,

00:14:30unlike crocodiles,

00:14:32because they don't have special glands

00:14:34to excrete salt from their bodies.

00:14:36Here is a newborn pigeon.

00:14:38You have probably seen thousands of pigeons

00:14:40in your life,

00:14:42but probably never a newborn.

00:14:44It's because newborn pigeons

00:14:46stay in the nest for about 6 weeks,

00:14:48which is longer than any other bird.

00:14:50When they come out of the nest,

00:14:52they look almost like adult pigeons.

00:14:54No wonder you never noticed the difference.

00:14:56In addition, they are probably

00:14:58the first domesticated birds by man,

00:15:00and they are experts in navigation.

00:15:02They can find their way

00:15:04to a distance of 2,000 km,

00:15:06which is more than the distance

00:15:08between New York and Florida.

00:15:10We think that pigeons

00:15:12have an innate sense of direction.

00:15:14In fact, in ancient times,

00:15:16mail was distributed by traveling pigeons.

00:15:18This is the mouth of a cow.

00:15:20These brushes are called papillonic.

00:15:22They help the cow

00:15:24to move food in its mouth.

00:15:26Cows have a field of vision

00:15:28of 330 degrees,

00:15:30so there are few things

00:15:32that can escape their attention.

00:15:34You remember that some turtles

00:15:36need only one hour of sleep per day.

00:15:38Cows sleep even less,

00:15:40about 30 minutes per day,

00:15:42and this time is divided into

00:15:446 to 10 short periods of deep sleep.

00:15:46These animals stay in bed position

00:15:48for about 10 hours a day,

00:15:50but the rest of the time they move,

00:15:52covering long distances,

00:15:54and they drink about 100 liters of water per day.

00:15:56Can you guess what it is?

00:15:58It's sand that has grown 300 times.

00:16:00Sand is broken rock

00:16:02in micro pieces

00:16:04after being eroded for millions of years.

00:16:06Microbial communities

00:16:08live on each grain of sand.

00:16:10Things can get really tiny

00:16:12in this world.

00:16:14Even if there is a lot of it on Earth,

00:16:16sand remains a precious material.

00:16:18Concrete is made from this material,

00:16:20and some countries,

00:16:22such as the United Arab Emirates

00:16:24and Singapore,

00:16:26have imported tons of sand

00:16:28to expand their territory

00:16:30by creating artificial islands.

00:16:32Apparently, this is what sinuses look like.

00:16:34They are hollow spaces

00:16:36in the water of your face,

00:16:38behind the forehead,

00:16:40the nose, the cheekbones,

00:16:42and between the eyes.

00:16:44They are very important

00:16:46because they produce mucus,

00:16:48which helps to detect tastes.

00:16:50Without this capacity,

00:16:52food would be much less tasty.

00:16:54Here is the inside of a bowling ball.

00:16:56You can see that it is not symmetrical,

00:16:58so the weight is not evenly distributed.

00:17:00This allows the ball

00:17:02to have curved trajectories.

00:17:04Did you know that bowling

00:17:06appeared 5,000 years ago in Ancient Egypt?

00:17:08Yes, it is not a new sport,

00:17:10and it was popular all over the world.

00:17:12But the rules and equipment

00:17:14were different everywhere.

00:17:16The first bowling alley

00:17:18was built only in the 19th century

00:17:20in New York.

00:17:22What is here is a Barbapapa

00:17:24that has been forgotten.

00:17:26Conclusion, do not forget it,

00:17:28otherwise it will shrink

00:17:30as if it had never existed.

00:17:32Barbapapa is composed of only two ingredients,

00:17:34colored sugar and air.

00:17:36So we now know the only ingredient

00:17:38in the world that is,

00:17:40so far, free, air.

00:17:42In addition, a thread of Barbapapa

00:17:44and a hair.

00:17:46By the way, December 7th

00:17:48is Barbapapa Day.

00:17:50Mark this day in your calendar

00:17:52for next year.

00:17:54With only two ingredients,

00:17:56this candy does not contain fat.

00:17:58In addition, it was created

00:18:00by a candy maker and a dentist.

00:18:02If you ever find yourself

00:18:04stuck in the trunk of your car,

00:18:06stay calm.

00:18:08All cars are supposed to be equipped

00:18:10with an emergency lock

00:18:12These locks are so well designed

00:18:14that they can be opened by anyone

00:18:16and whatever their age.

00:18:18In addition, the handles are designed

00:18:20to be bright in the dark.

00:18:22You can even pull them with your mouth

00:18:24if there is not enough room to use your hands.

00:18:26And this, no matter how you landed

00:18:28in this trunk.

00:18:30Change of subject.

00:18:32If you work with thread and a needle,

00:18:34do not forget that it is not necessary

00:18:36to plant the needle directly into the coil.

00:18:38You would risk losing it,

00:18:40which could easily prick you

00:18:42and hurt your fingers.

00:18:44Nowadays, many sewing kits

00:18:46are equipped with a place

00:18:48reserved for needle storage.

00:18:50It is located at the bottom

00:18:52of the thread coil.

00:18:54Just take it out.

00:18:56It is even possible to store

00:18:58several needles at once.

00:19:00The throwable pencils have a little secret.

00:19:02Have you ever noticed that on some of them

00:19:04there is a small hole in the plastic part?

00:19:06It is actually a basic ventilation system.

00:19:08It is supposed to allow the ink

00:19:10to easily reach the tip of the pen.

00:19:12Okay, I know it's a super common reflex,

00:19:14but it is not really necessary

00:19:16to shake the spice dispensers

00:19:18to get the product out.

00:19:20You don't believe me? You're not the only one.

00:19:22So go get your favorite salt or pepper bottle

00:19:24in your closet.

00:19:26If it has one of these removable plastic caps,

00:19:28it is perfect for this experiment.

00:19:30Instead of shaking the bottle,

00:19:32try to hold it by the plastic cap

00:19:34while it is upside down.

00:19:36Slowly turn the bottle

00:19:38from one side to the other

00:19:40and you will see that the spice will flow

00:19:42without you shaking the bottle

00:19:44and messing up your kitchen.

00:19:46In the same order of ideas,

00:19:48most salt dispensers and pepper dispensers

00:19:50are equipped with strips

00:19:52at the bottom of the upside-down part.

00:19:54In case the seasoning gets stuck inside,

00:19:56place the bottom of the salt dispenser

00:19:58against the bottom of the pepper dispenser

00:20:00and make small circles

00:20:02so that the ridges

00:20:04can flow easily

00:20:06without you opening the bottle.

00:20:08When it is cold,

00:20:10it often happens that you wear so many layers of clothing

00:20:12that you can hardly feel the straps

00:20:14of your handbag or backpack on your shoulders.

00:20:16Not to mention the speed

00:20:18with which they slip.

00:20:20Some jackets have an integrated solution

00:20:22to fix this problem,

00:20:24in the form of a small strap on the shoulder

00:20:26with a hook or button.

00:20:28It is designed to open and close easily

00:20:30so that you can keep

00:20:32your space permanently.

00:20:34Most of the time, a peeler

00:20:36is only used to remove the skin of potatoes,

00:20:38carrots or cucumbers.

00:20:40But you can also use your vegetable peeler

00:20:42to cut thin slices of onion.

00:20:44All you have to do is cut the onion

00:20:46into four vertically,

00:20:48then start slicing it.

00:20:50This can also prevent you from crying

00:20:52with your onion.

00:20:54Most people don't pay attention to it,

00:20:56but if you ever take a closer look

00:20:58at your toothpaste tube,

00:21:00you will see that there are colored dots,

00:21:02whether they are dots or squares.

00:21:04The colors can vary.

00:21:06They can be black, green, red or even blue.

00:21:08These colored dots are actually

00:21:10intended to help the toothpaste assembly machines.

00:21:12They let you know

00:21:14where and when these machines

00:21:16have to cut the toothpaste tubes

00:21:18and fold them to pack them.

00:21:20Look at your shoes.

00:21:22If there is an element that seems a little strange to you,

00:21:24know that it is always there for a good reason.

00:21:26Most manufacturers

00:21:28don't add additional elements to shoes

00:21:30just for fun.

00:21:32It would be a waste of time and money.

00:21:34On winter shoes, for example,

00:21:36there is often a small loop at the top and back.

00:21:38It is there to help you put them on

00:21:40because you can adjust it quickly

00:21:42by pulling on it.

00:21:44In addition, it also allows you to suspend the soles somewhere,

00:21:46probably to dry them

00:21:48because most of these little boots

00:21:50are designed to be worn

00:21:52during the coldest and humidest months.

00:21:54I admit that it has already happened to me

00:21:56several times to accumulate layers of clothing

00:21:58to avoid having to put everything in my bag.

00:22:00But this becomes problematic

00:22:02when it comes to sitting down.

00:22:04What do you do with your coat or jacket?

00:22:06The next time you take the plane,

00:22:08look closer at the seat in front of you.

00:22:10The hook that holds the tablet

00:22:12vertically can be used as a hook

00:22:14for your jacket.

00:22:16As long as you don't need to have a meal

00:22:18during the flight, you can use it.

00:22:20Most mascaras last

00:22:22between 3 and 6 months,

00:22:24but you can speed up this process

00:22:26if you don't pay attention.

00:22:28By continuously pumping the brush

00:22:30of the mascara to try to distribute

00:22:32more product, you fill the tube

00:22:34with air.

00:22:36The mascara then dries much faster

00:22:38and it gets damaged faster

00:22:40and no longer fulfills its mission as before.

00:22:42There is a simple way to check

00:22:44if your mascara is still good enough to be used.

00:22:46If you don't hear a little plop

00:22:48when you take out the brush,

00:22:50you may need to buy a new one.

00:22:52I know that we live in an era of

00:22:54Bluetooth connected devices.

00:22:56But for a better quality sound,

00:22:58it is always recommended to use

00:23:00headphones that connect via audio jacks.

00:23:02Do you remember noticing black stripes

00:23:04on these jacks?

00:23:06They are not there just to hold them

00:23:08when you plug them into your phone

00:23:10or laptop.

00:23:12Made in a special insulating material,

00:23:14these bands are designed to protect

00:23:16the wires during sound transmission.

00:23:18Depending on the number of bands,

00:23:20the length of the band may vary.

00:23:22An empty space under a cup of noodles

00:23:24does not mean that the company

00:23:26that produced them wanted to scam you

00:23:28by depriving you of a complete portion.

00:23:30No, no, it is a way to protect

00:23:32the noodles during their transport.

00:23:34It also facilitates the circulation

00:23:36of hot water that is poured on the noodles

00:23:38before they are tasted.

00:23:40This V-neck collar was originally designed

00:23:42to meet several objectives.

00:23:44First of all, it is a way to extend

00:23:46the lifetime of the garment

00:23:48and to keep it in good shape over the years.

00:23:50It also serves to pass the head

00:23:52through the sweater in case it

00:23:54needs to be stretched.

00:23:56In this way, it ensures a better grip

00:23:58around the neck.

00:24:00Finally, it helps to absorb sweat

00:24:02if you wear the jacket during a sports session.

00:24:04It is no longer a common practice,

00:24:06but you may one day come across

00:24:08a jacket with a mysterious additional pocket

00:24:10on the right side.

00:24:12It turns out that this pocket was once

00:24:14used by men to easily access

00:24:16their train tickets,

00:24:18because most of them went to work every day.

00:24:20It allowed them to keep their buttoned jacket

00:24:22while benefiting from a pocket.

00:24:24Today, it is no longer

00:24:26a useless decoration.

00:24:28Speaking of things that we no longer use today

00:24:30or at least not in their initial purpose,

00:24:32did you know that Pledo

00:24:34was originally a cleaning product?

00:24:36In the 1920s,

00:24:38industrialists needed a product

00:24:40that would help them clean the upholstered area

00:24:42around the charcoal ovens.

00:24:44The recipe for what we know today

00:24:46under the name of Pledo

00:24:48was thus invented.

00:24:50It was made only in white and was supposed

00:24:52to clean the bread paper by being rolled

00:24:54back and forth on the dirt.

00:24:56It was only later, in the 1940s,

00:24:58that new products intended

00:25:00to clean the bread paper were born

00:25:02and that Pledo reoriented itself

00:25:04towards another sector of the market.

00:25:06Although I am always delighted

00:25:08to eat a good piece of toasted bread

00:25:10for breakfast, isn't it boring

00:25:12to clean the bread paper?

00:25:14Well, not anymore, because I recently discovered

00:25:16that bread papers are equipped with a slide

00:25:18or a panel at the bottom

00:25:20that makes it easy to get rid

00:25:22of all these annoying crumbs.

00:25:24It was a time when video games

00:25:26could only be used by inserting cartridges

00:25:28into the console of your choice.

00:25:30However, these small objects have given

00:25:32a lot of headaches to many doctors.

00:25:34People, especially the youngest,

00:25:36began to end up in the hospital

00:25:38after swallowing small game cartridges.

00:25:40Nintendo, the company that manufactures

00:25:42most of these devices,

00:25:44had to find a creative solution

00:25:46to avoid these accidents.

00:25:48That is why, nowadays,

00:25:50Nintendo Switch cartridges are

00:25:52voluntarily coated with special chemicals

00:25:54that leave a really unpleasant

00:25:56bitter taste in the mouth.

00:25:58Clearly, I do not recommend you

00:26:00to try and taste for yourself.

00:26:02Have you ever vibrated in your room

00:26:04listening to some of your favorite songs

00:26:06and admiring the bass of your speakers

00:26:08while they delight your eardrums

00:26:10at high decibels?

00:26:12And have you ever wondered

00:26:14why this same speaker,

00:26:16as well as so many other speakers

00:26:18around the world, are almost always black?

00:26:20Some of you are probably

00:26:22screaming on their screens

00:26:24right now to say that their speakers

00:26:26are green, red or any other color

00:26:28of the rainbow.

00:26:30First, we said almost always.

00:26:32And then, if you look carefully

00:26:34at the beautiful design of your music player

00:26:36in bright colors,

00:26:38you will see that the speaker below

00:26:40is always black.

00:26:42A possible explanation for this

00:26:44is that the original technology

00:26:46had a diaphragm with black particles on it.

00:26:48Thus, as soon as a sound is amplified,

00:26:50it sends a charge through the diaphragm

00:26:52and these black particles are pushed up.

00:26:54The carbon particles that bounce

00:26:56and touch the upper membrane of the diaphragm

00:26:58are responsible for the creation

00:27:00of some of the distinct sounds

00:27:02of our speakers that we are mounting.

00:27:04The speakers manufacturers

00:27:06must have had enough

00:27:08to see their products change color

00:27:10in case of prolonged use

00:27:12and to see these black particles

00:27:14deposit on the upper membrane

00:27:16of the diaphragm.

00:27:18Their logical solution

00:27:20was to color most speakers in black.

00:27:22Another more practical reason

00:27:24why speakers are most often colored

00:27:26in black is that it is a color

00:27:28that fits easily with many types of decor.

00:27:30Walls, furniture and clothes

00:27:32are often raised when they are combined

00:27:34with this color.

00:27:36This is why it is so widespread.

00:27:38According to several studies,

00:27:40listening to music has been ranked

00:27:42several times in the top 10

00:27:44of our favorite pastimes around the world.

00:27:46Nowadays, we find speakers everywhere.

00:27:48In your television,

00:27:50your laptop and your phone.

00:27:52You can't escape them.

00:27:54But let's take a look at how it all started.

00:27:56Their origins are found

00:27:58in radio and telephone technology.

00:28:00The first type of speaker

00:28:02was developed by Johann Philipp Reiss

00:28:04in 1861.

00:28:06This self-taught German inventor

00:28:08installed the speaker on his phone.

00:28:10He was just able to reproduce

00:28:12light tones,

00:28:14but he could also reproduce

00:28:16muffled words after a few revisions.

00:28:18Alexander Graham Bell,

00:28:20the inventor of the telephone,

00:28:22decided to try to produce an improved version

00:28:24of Reiss's speaker.

00:28:26Basically, Bell and other inventors

00:28:28wanted to make an electro-dynamic speaker.

00:28:30In 1877,

00:28:32it still didn't exist,

00:28:34but thanks to the desire of inventors

00:28:36from all over the world to change that,

00:28:38research has confirmed that it was

00:28:40quite possible to make one.

00:28:42In particular, the work of Werner von Siemens,

00:28:44who had the idea of a coil electromagnetic speaker,

00:28:46was a driving force

00:28:48to come to this conclusion.

00:28:50Next question.

00:28:52Why are there magnets in speakers?

00:28:54Nowadays,

00:28:56every speaker is powered

00:28:58by an electric current,

00:29:00which inventors we have mentioned

00:29:02would simply never have considered as acquired.

00:29:04When this electric current changes,

00:29:06it produces a magnetic field.

00:29:08To move the speaker panel,

00:29:10magnets are used to create

00:29:12an opposite magnetic field

00:29:14that creates vibrations.

00:29:16These vibrations are the sound

00:29:18we end up hearing.

00:29:20The bigger the magnet,

00:29:22the louder the speaker will be.

00:29:24Thomas Edison had

00:29:26a patent in the UK

00:29:28for a system using compressed air

00:29:30in an amplification mechanism.

00:29:32The first commercial

00:29:34electric speaker was born

00:29:36in 1924.

00:29:38The sound produced by this speaker

00:29:40was good enough for the cinema.

00:29:42It took almost 20 years

00:29:44to witness

00:29:46the next breakthrough in the world of speakers.

00:29:48It happened

00:29:50with the arrival of the Duplex Driver in 1943.

00:29:52It offered greater clarity

00:29:54and better coherence

00:29:56in high volumes,

00:29:58which was important in cinemas.

00:30:00That's why it was nicknamed

00:30:02the voice of cinema.

00:30:04The Duplex Driver was immediately tested

00:30:06by the Academy of Arts and Sciences of Cinema

00:30:08and became the norm

00:30:10of the cinematographic industry

00:30:12in 1955.

00:30:14This conception of speakers

00:30:16is still used today.

00:30:18Indeed, the cinematographic industry

00:30:20seems to make a lot of effort for its acoustics,

00:30:22just like the rooms in which

00:30:24we see the films.

00:30:26You may have noticed that these rooms

00:30:28are often thick curtains on the walls.

00:30:30These are insonorized or acoustic curtains

00:30:32and they are much thicker

00:30:34than standard curtains.

00:30:36They are made of heavier fabric

00:30:38and are woven tight

00:30:40or have better quality lining.

00:30:42This allows them to absorb the sound

00:30:44and reduce the acoustic reflection

00:30:46of the ceiling and the walls of the room.

00:30:48In the end, it creates

00:30:50a much better sound experience.

00:30:52It is for the same reason

00:30:54that the curtains are so thick

00:30:56in cinemas.

00:30:58They help to trap the sound

00:31:00by providing an isolation

00:31:02from a practical point of view.

00:31:04This curtain is also there

00:31:06to prevent the noise of the steps

00:31:08during the projection of the films.

00:31:10This concept of sound trap

00:31:12is also the reason why

00:31:14putting a phone in a cup

00:31:16in an open space

00:31:18projects its sound in all directions.

00:31:20When the speaker vibrates

00:31:22to create sound waves,

00:31:24an equal amount of energy

00:31:26goes from the front and the back.

00:31:28By placing a speaker

00:31:30in a form of speaker,

00:31:32we can redirect some of the energy

00:31:34that comes from the back of the speaker

00:31:36and project it forward.

00:31:38By placing the speaker in a cup,

00:31:40you redirect the sound more effectively.

00:31:42It only travels in one direction,

00:31:44not in the other.

00:31:46Speaking of phones and speakers,

00:31:48have you ever wondered

00:31:50why your mobile phone

00:31:52generates a noise in your speaker?

00:31:54This can happen when

00:31:56two gadgets are close to each other

00:31:58and your mobile phone

00:32:00tries to send and receive data.

00:32:02The transfer of information

00:32:04produces electromagnetic disturbances

00:32:06in the environment of the speakers.

00:32:08This creates noise in the audio

00:32:10and, as a result,

00:32:12a simple way to avoid

00:32:14this annoying noise

00:32:16is to simply move your phone

00:32:18away from your speaker or vice versa.

00:32:20This will eliminate what we call

00:32:22electromagnetic interferences.

00:32:24Research conducted in the United States

00:32:26showed that, on average,

00:32:2874% of people

00:32:30had at least two pairs of headphones

00:32:32or two audio headphones.

00:32:3446% of them mentioned

00:32:36that they used their headphones

00:32:38or headphones more than two hours a day.

00:32:40Some choose their headphones

00:32:42or headphones based on their appearance,

00:32:44others based on the quality of the sound.

00:32:46In both cases,

00:32:48finding the right gadget is important

00:32:50because many people are willing

00:32:52to devote more than a hundred euros to it.

00:32:54Headphones and other headphones

00:32:56have become real fashion accessories.

00:32:58This is why well-known personalities

00:33:00try to have an impact on this industry,

00:33:02as if it were fashion.

00:33:04Music enthusiasts Dr. Dre

00:33:06and Jimmy Yovine

00:33:08are the founders of the now world-famous brand

00:33:10Beats by Dre.

00:33:12They were walking along the Pacific Ocean

00:33:14one day in 2006

00:33:16discussing a sports shoe business

00:33:18because they had received an offer

00:33:20from a major brand in this field.

00:33:22After a few discussions,

00:33:24they decided that they wanted to do

00:33:26something that they were more passionate about

00:33:28and decided to sell their headphones.

00:33:30The idea of the duo turned into a brand

00:33:32bought by Apple in 2014

00:33:34for $3 billion.

00:33:36This was the beginning of Apple's history

00:33:38and Beats by Dre controlled 70%

00:33:40of the headphones market

00:33:42at the time of the signing.

00:33:44This operation allowed Apple

00:33:46to take control of this sector.

00:33:48The release in 2016 of their famous wireless headphones,

00:33:50the Airpods,

00:33:52comforted the company in this position.

00:33:54But how do these wireless headphones

00:33:56that many of us have,

00:33:58really work?

00:34:00They actually depend on internal batteries

00:34:02to have enough power

00:34:04Most often,

00:34:06they have built-in rechargeable batteries

00:34:08but sometimes they continue to work

00:34:10thanks to AA or AAA standard batteries.

00:34:12They receive signals transmitted wirelessly

00:34:14from their paired audio sources.

00:34:16Whether it's your phone

00:34:18or your laptop,

00:34:20these signals are coded by the device

00:34:22and transmitted most often

00:34:24by radio frequencies or infrared supports.

00:34:26The headphones receive the signal

00:34:28and decode it into audio

00:34:30and you can enjoy your music

00:34:32in complete freedom.

00:35:02The Airpods were invented

00:35:04in the early 19th century

00:35:06but they only started to be used

00:35:08in the 1960s.

00:35:10Pre-collision sensors

00:35:12have moved security devices

00:35:14to a higher level.

00:35:16By effectively predicting

00:35:18the collision of a car,

00:35:20this technology orders the seatbelts

00:35:22to tighten automatically,

00:35:24to open the airbags

00:35:26and to activate the brakes

00:35:28to reduce the impact.

00:35:30This is why

00:35:32we must continue to develop

00:35:34security devices

00:35:36not only to mitigate accidents

00:35:38but also to protect passengers

00:35:40more effectively.

00:35:42The materials that make up the body

00:35:44have only started to be replaced

00:35:46in the last 25 years,

00:35:48from aluminum and magnesium alloys

00:35:50to carbon fiber composites.

00:35:52These lighter materials

00:35:54not only save fuel

00:35:56but also guarantee

00:35:58that the body offers

00:36:00a deformation zone.

00:36:02When a car hits an object,

00:36:04this zone absorbs the energy

00:36:06of the impact.

00:36:08But if this seems to cause

00:36:10more damage to the car,

00:36:12it actually protects the passengers

00:36:14better.

00:36:16The bumpers are widely underestimated

00:36:18and since we have been using them

00:36:20it would be hard to imagine

00:36:22without passing.

00:36:24The bumpers were invented

00:36:26in the 1950s

00:36:28and have evolved

00:36:30until we no longer realize

00:36:32that we have them.

00:36:34But they are right here,

00:36:36hidden under the outer coatings

00:36:38made of foam or compressible plastic

00:36:40surrounding a reinforced bar.

00:36:42All the windows of your car

00:36:44are made of glass

00:36:46but the windshield is designed

00:36:48to be unbreakable.

00:36:50It is sheeted

00:36:52so that whatever the impact

00:36:54of the impact

00:36:56does not damage

00:36:58the windshield.

00:37:00The bumpers

00:37:02seem to have always existed.

00:37:04In fact,

00:37:06they were invented in 1968

00:37:08and were ahead of their time.

00:37:10They then slowly

00:37:12gained popularity

00:37:14and became mandatory

00:37:16on all cars

00:37:18from 1998.

00:37:20They have also evolved

00:37:22and are no longer limited

00:37:24to a simple airbag in the steering wheel.

00:37:26Today we can find them

00:37:28everywhere in the car

00:37:30to ensure the safety

00:37:32of all passengers.

00:37:34Collision sensors

00:37:36connected to an on-board computer

00:37:38detect the moment

00:37:40when a shock occurs

00:37:42and triggers the bags

00:37:44which inflate in a few milliseconds.

00:37:46It can be difficult

00:37:48to anticipate the weather

00:37:50but the ABS anti-skid system

00:37:52has been put in place on cars.

00:37:56Before, it was used

00:37:58on many aircraft

00:38:00whose design dates back to 1908.

00:38:02It quickly became necessary

00:38:04on all vehicles

00:38:06thus ensuring better grip

00:38:08on slippery surfaces

00:38:10and better wheel control

00:38:12during braking.

00:38:14Today, ABS has progressed

00:38:16so much that the latest versions

00:38:19of the speed regulator

00:38:21invented in 1948

00:38:23have continued to evolve over the years.

00:38:25Today,

00:38:27the adaptive speed regulator

00:38:29ensures that when the car

00:38:31drives at a constant speed

00:38:33and detects a slower car in front of it,

00:38:35it adapts its speed to the latter.

00:38:37Other variants

00:38:39ensure that the car

00:38:41stops on its own

00:38:43if the vehicle in front of it

00:38:45makes a mistake.

00:38:48Automatic lights

00:38:50are becoming more and more common.

00:38:52Cameras

00:38:54determine the type of light

00:38:56in real time

00:38:58and help determine

00:39:00whether the road lights

00:39:02should be turned on or not.

00:39:04Although automatic lights

00:39:06have existed since the 1950s,

00:39:08the old models used sensors

00:39:10sensitive to light

00:39:12and were much less reliable.

00:39:14New models can identify

00:39:16the direction of the sun,

00:39:18the direct light of a car

00:39:20coming in front of it

00:39:22or even the reflection of a panel,

00:39:24which allows to adapt the lights

00:39:26and thus avoid

00:39:28disturbing other drivers.

00:39:30It is sometimes difficult

00:39:32to ensure that no one

00:39:34is in the famous blind spot,

00:39:36which causes about

00:39:38400,000 accidents per year in the USA.

00:39:40The solar sensors

00:39:42located in the rear bumper

00:39:44can tell the driver

00:39:46if a vehicle is on the next lane,

00:39:48either by the lights

00:39:50flashing on the dashboard

00:39:52or by the beeps

00:39:54reducing the danger.

00:39:561.6 million road accidents

00:39:58are caused by the use

00:40:00of a mobile phone

00:40:02and the fatigue

00:40:04is at least 10%

00:40:06of car accidents.

00:40:08The driver's attention

00:40:10monitoring system

00:40:12monitors the movement

00:40:14of the car

00:40:16and the number of corrections

00:40:18in order to ensure

00:40:20that the driver

00:40:22remains attentive.

00:40:24When the on-board computer

00:40:26identifies that the driver

00:40:28is not well awake

00:40:30or that he is distracted

00:40:32by his phone,

00:40:34it emits signals

00:40:36indicating that it is time

00:40:38to take a break.

00:40:40To ensure that your tires

00:40:42are always in perfect condition,

00:40:44the tire pressure control system

00:40:46checks the air pressure

00:40:48in the four tires

00:40:50and indicates when to increase

00:40:52or decrease the pressure

00:40:54to avoid any risk.

00:40:56The constant evolution

00:40:58of technology

00:41:00ensures your safety

00:41:02on long journeys.

00:41:04The white line crossing

00:41:06sensors focus on the marking

00:41:08and a camera identifies

00:41:10and signals it to the driver.

00:41:12The lane assist function

00:41:14follows the same method

00:41:16to prevent the car

00:41:18from getting stuck

00:41:20on the adjacent lane.

00:41:22If it gets too close,

00:41:24it automatically adjusts

00:41:26the direction to

00:41:28re-center the car

00:41:30on its lane.

00:41:32The most modern cars

00:41:34even have autonomous driving

00:41:36that allows the vehicle

00:41:38to stay in its lane

00:41:40while maintaining speed

00:41:42but also to change lanes

00:41:44when necessary.

00:41:46Some devices are progressively

00:41:48used in all car models.

00:41:50For example, the night vision

00:41:52uses thermographic cameras

00:41:54to locate pedestrians

00:41:56and animals.

00:41:58It integrates with the on-board computer

00:42:00and identifies objects

00:42:02based on their thermal signature.

00:42:04There are more than

00:42:06one billion cars in traffic

00:42:08around the world.

00:42:10As the world population

00:42:12increases, we expect

00:42:14the number of cars

00:42:16to increase as well.

00:42:18Safety devices

00:42:20are constantly evolving.

00:42:22Infrared headlights

00:42:24will soon be used

00:42:26in bad visibility conditions

00:42:28such as storms, snow

00:42:30and fog.

00:42:32The driver's control systems

00:42:34will soon be able to monitor

00:42:36and identify these different behaviors.

00:42:38Whether it is while driving

00:42:40or for other safety reasons,

00:42:42cars will soon be able

00:42:44to take control themselves

00:42:46thus ensuring the safety

00:42:48of all passengers.

00:42:50The augmented reality

00:42:52headlamps that are being developed

00:42:54allow you to display certain elements

00:42:56of the dashboard on the headlamp.

00:42:58So, soon, all the most useful

00:43:00elements will appear

00:43:02right in front of the driver

00:43:04so that he does not lose sight of the road.

00:43:06Airbags will no longer

00:43:08only be used inside the car,

00:43:10but will also be activated

00:43:12from outside the car

00:43:14when they detect an imminent collision.

00:43:16They will cover the entire

00:43:18surface of the car

00:43:20to reduce the impact.

00:43:22This technology could be so advanced

00:43:24that the body would no longer

00:43:26need to be repaired.

00:43:28Future technologies should be so advanced

00:43:30that the cars themselves

00:43:32will have their own form of communication.

00:43:34Not with the drivers,

00:43:36but with other cars.

00:43:38Imagine cars sharing information

00:43:40when they identify roadblocks,

00:43:42road problems

00:43:44or certain weather phenomena.

00:43:46All this will guarantee

00:43:48the most efficient route

00:43:50and a safer trip.

00:43:52Well, I know it's a bit cold

00:43:54or touchy, especially during

00:43:56winter glaciers, but did you know

00:43:58that brass door handles

00:44:00are really useful,

00:44:02in addition to being elegant and shiny?

00:44:04As it is a copper alloy,

00:44:06brass has antimicrobial properties.

00:44:08This means that it can help

00:44:10eliminate germs and harmful bacteria,

00:44:12sometimes in less than two hours.

00:44:14In very busy places,

00:44:16it is even more useful.

00:44:18But since brass is much more expensive

00:44:20than other metals such as nickel and steel,

00:44:22we no longer see many door handles

00:44:24of this type today.

00:44:26Speaking of beautiful polyvalent objects,

00:44:28most screwdrivers have

00:44:30a little secret that is their own.

00:44:32They can sometimes slip into a key

00:44:34to create more torque

00:44:36during torsion.

00:44:38Not to mention their usefulness

00:44:40when it comes to screws located in difficult places.

00:44:42There is a reason why

00:44:44women's shirt buttons are intended for left-handed

00:44:46and this has nothing to do

00:44:48with fashion.

00:44:50This practice dates back to the time

00:44:52when buttons helped women to get dressed

00:44:54and it was easier for them to accomplish their tasks

00:44:56with this orientation.

00:44:58The fact that buttons are placed in this way

00:45:00is a sign of wealth.

00:45:02It is therefore easy to imagine

00:45:04why this practice has persisted

00:45:06even if most people

00:45:08dress themselves nowadays.

00:45:10The next time you receive a package in your mail,

00:45:12take a look at the cutter.

00:45:14If it has diagonal lines on the blade,

00:45:16you will be able to benefit from a small advantage

00:45:18in terms of design.

00:45:20To avoid having to buy

00:45:22a brand new cutter,

00:45:24the upper segment of the next line

00:45:26can break

00:45:28to get a new super-sharp one.

00:45:30To do this,

00:45:32look at the small hole

00:45:34at the base of the tool,

00:45:36sometimes called the blade breaker.

00:45:38The people who came up with this brilliant invention

00:45:40are engineers who were inspired

00:45:42by the way chocolate bars are divided.

00:45:44Wait a minute!

00:45:46Don't throw this package away right away.

00:45:48It is very likely

00:45:50that you have silica gel bags

00:45:52somewhere at the bottom of the box.

00:45:54As this gel is a drying tool,

00:45:56it absorbs the humidity of its environment

00:45:58so that you can keep

00:46:00these bags for other occasions.

00:46:02If you need to dry your phone

00:46:04or another electrical object,

00:46:06you can place it in a container

00:46:08next to the silica gel to reduce damage.

00:46:10No need to be a mechanic

00:46:12to know when the tires of a standard car

00:46:14need to be replaced

00:46:16with a well-designed indicator.

00:46:18If you look closer,

00:46:20you will see that the tire strips

00:46:22are made up of a pile of rubber notches.

00:46:24When the marks are equal to the perpendicular bars,

00:46:26this is the sign that you must

00:46:28make an appointment

00:46:30with your local car service

00:46:32because it is very likely

00:46:34that the tires have lost

00:46:36most of their traction

00:46:38and that they are no longer safe for driving.

00:46:40The upper corners of a car's windshield

00:46:42have textured black dots

00:46:44but this detail is not there

00:46:46for design reasons.

00:46:48It is a coated coating,

00:46:50which means that a special type

00:46:52of ceramic paint is added to the glass

00:46:54to protect its sealant from UV rays.

00:46:56It also allows you to hide

00:46:58and create a more coarse surface

00:47:00for the glue used to put the glass in place.

00:47:02Every time you hit the road,

00:47:04check if there is a small strip

00:47:06under the rearview mirror of your car.

00:47:08I bet you didn't know

00:47:10that it was there to help

00:47:12you see at night.

00:47:14It uses a prismatic glass technology

00:47:16to blur the reflection

00:47:18and reduce the glare of the headlights

00:47:20behind you in traffic.

00:47:22These manual rearview mirrors

00:47:24were invented in the 1930s

00:47:26but they became the norm

00:47:28in the 1970s.

00:47:30When you are in the car,

00:47:32take a look at the headrests

00:47:34because you probably don't know

00:47:36that they have a hidden function.

00:47:38Of course, they can be adjusted

00:47:40so that the driver benefits

00:47:42from adequate support for their head and neck.

00:47:44The hidden feature is that they are detachable

00:47:46and have very solid metal bars.

00:47:48If you ever get stuck in a car

00:47:50and you have to run away quickly,

00:47:52these bars can be very useful

00:47:54to break the windows of the car.

00:47:56So you're driving around

00:47:58and you suddenly run out of gas.

00:48:00What I'm going to describe to you

00:48:02looks more like a joke

00:48:04than a real situation

00:48:06likely to occur.

00:48:08What happens if you are in such a hurry

00:48:10that you accidentally leave

00:48:12with the gasoline gun

00:48:14still in the tank?

00:48:16Well, the guns were designed

00:48:18to avoid any risk.

00:48:20They are equipped with a separation device

00:48:22that allows the pipe to be detached

00:48:24when it is removed with enough force.

00:48:26Initially designed in the early 20th century

00:48:28to be worn exclusively

00:48:30by basketball players,

00:48:32baskets have quickly become

00:48:34one of the essential elements of fashion

00:48:36just like jeans and leather jackets.

00:48:38If you look at them closely,

00:48:40you will see that they have

00:48:42two additional holes on the side

00:48:44similar to those of shoe laces.

00:48:46They are made like this

00:48:48not only to provide additional ventilation

00:48:50but also to allow people

00:48:52to be more creative with their laces

00:48:54when they wear their shoes.

00:48:56Admit it, you always thought

00:48:58that the chopsticks are united at one end

00:49:00in order to keep them together

00:49:02until you are ready to start your meal.

00:49:04This may not be quite true.

00:49:06If you look at them closely,

00:49:08you will see that these wooden tools

00:49:10have a square-shaped end.

00:49:12The chopsticks made in this way

00:49:14are from an old Japanese traditional design

00:49:16that allows you to break

00:49:18the ends easily.

00:49:20The separated end can then be used

00:49:22as a support for the chopsticks

00:49:24in order to keep them cleaner

00:49:26in the hope that they can be reused

00:49:28since they will not touch the table

00:49:30or any other surface.

00:49:32Women's bikes have a special design

00:49:34that surprisingly has a historical

00:49:36and fashionable function.

00:49:38The lower frame is largely intended

00:49:40to compensate for the generally smaller size

00:49:42of women compared to that of a normal man.

00:49:44If this is the case for the handlebars

00:49:46and the saddle, the general frame

00:49:48is lower for an additional reason.

00:49:50At the time when women wore long skirts

00:49:52and dresses all day,

00:49:54every day they had to make sure

00:49:56that their clothes would not get stuck in the frame.

00:49:58This is how we designed a bike

00:50:00with a lower frame,

00:50:02perfectly adapted to women

00:50:04and their needs of the time.

00:50:06The fact that the toothpaste is multicolored

00:50:08is not only a nice advantage

00:50:10to make dental hygiene more fun.

00:50:12There is a secret explanation

00:50:14related to each of the colors

00:50:16dating back to the 1970s.

00:50:18At that time, people were increasingly

00:50:20interested in their oral dental health

00:50:22and were therefore looking for products

00:50:24that could do more than just

00:50:26clean the teeth.

00:50:28This is what you can do

00:50:30by adding a mouthwash

00:50:32to your toothpaste,

00:50:34that is, the blue strip.

00:50:36She then added the red strip

00:50:38intended to contain ingredients

00:50:40that help you take care of your gums.

00:50:42Speaking of toothpaste,

00:50:44check the cap the next time

00:50:46you open a new tube,

00:50:48you may have a little surprise.

00:50:50There is a kind of pointed cone

00:50:52inside the cap,

00:50:54which allows you to pierce

00:50:56your teeth without transferring

00:50:58germs or other bacteria

00:51:00into the product itself.

00:51:02As for the articles to be placed

00:51:04on the counter of the bathroom,

00:51:06toothbrushes are equipped

00:51:08with a very practical accessory

00:51:10hidden in the hairs.

00:51:12In addition to giving the toothbrush

00:51:14a cooler look,

00:51:16they also have a practical purpose.

00:51:18Most toothbrushes are equipped

00:51:20with a pattern of blue hairs

00:51:22intertwined in white hairs.

00:51:24Dentists say

00:51:26that toothbrushes must be replaced

00:51:28every 3 to 4 months,

00:51:30but this gives a good reminder

00:51:32in case of forgetfulness.

00:51:34Do you still like to play with Legos?

00:51:36I don't judge you,

00:51:38it's a great hobby for all ages.

00:51:40Note that there is a hole

00:51:42above the heads of Legos.

00:51:44This is a safety device

00:51:46that Legos have designed

00:51:48to avoid the risk of suffocation.

00:51:50The most dangerous problem

00:51:52is the presence of a hole

00:51:54inside the Lego head,

00:51:56allowing air to flow freely

00:51:58through the piece

00:52:00until it can be safely removed.

00:52:02We are now used to

00:52:04all kinds of modern bulbs,

00:52:06some in tubular form,

00:52:08others in diamond form,

00:52:10and others still completely twisted.

00:52:12Historically, bulbs were round

00:52:14and this initial shape

00:52:16was useful in itself.

00:52:18It was mainly due to the fact

00:52:20that the bulb filament

00:52:22had to be at the same distance

00:52:24from each surface

00:52:26of the glass sphere.

00:52:28The easiest way to achieve this

00:52:30was to make the glass

00:52:32in the shape of a globe.

00:52:34The cylinder

00:52:36at the end of a cable

00:52:38is placed there

00:52:40and seems totally useless.

00:52:42In fact,

00:52:44it is a ferrite pearl

00:52:46that is associated

00:52:48with the electromagnetic interference.

00:52:50The electric wires

00:52:52act as involuntary antennas

00:52:54and diffuse the emitted energy.

00:52:56There is a reason why

00:52:58the plate inside the microwave

00:53:00is circular.

00:53:02A circular object evenly distributes

00:53:04heat, unlike rectangular

00:53:06or square objects.

00:53:08When you place containers

00:53:10with these shapes inside,

00:53:12the energy is concentrated

00:53:14on the corners

00:53:17The temperature gauge

00:53:19of a bread grill

00:53:21is generally used

00:53:23to determine the degree

00:53:25of cooking of the pies.

00:53:27But the other, more specific

00:53:29use of the gauge

00:53:31is that of the different types

00:53:33of bread.

00:53:35White and sweet breads

00:53:37heat up much faster

00:53:39than brown and rye breads

00:53:41and are heavier.

00:53:43The older the bread,

00:53:45the easier it is to cook

00:53:47a plate inside.

00:53:49You probably think

00:53:51that the goal is to cool

00:53:53the oven after use.

00:53:55In fact, its goal

00:53:57is to focus on the cooking

00:53:59of the top of the dish

00:54:01and ensure a crispy layer.

00:54:03By controlling the accumulation

00:54:05of heat and steam

00:54:07by releasing it through

00:54:09the slightly open door,

00:54:11you get the desired result

00:54:13for each type of dish.

00:54:15But all dishes

00:54:17must be oriented

00:54:19towards the center

00:54:21and not in the same direction.

00:54:23The types of food

00:54:25on the plates

00:54:27will also determine

00:54:29their location in the lockers.

00:54:31Since the center of the machine

00:54:33receives the strongest gel,

00:54:35stains made of glucide

00:54:37from tomatoes and potatoes

00:54:39must be placed here.

00:54:41The ceiling fans

00:54:43push the fresh air down

00:54:45when it's hot,

00:54:47making the room circulate.

00:54:49But they can serve you

00:54:51just as effectively

00:54:53in winter

00:54:55if you engage the switch

00:54:57on the side

00:54:59or if you use the pull.

00:55:01So if you want to save money

00:55:03on heating

00:55:05and try to heat your room

00:55:07quickly on a cold day,

00:55:09you can put the fan on.

00:55:11It will push the air up

00:55:13and spread the hot air around you,

00:55:15heating the room more efficiently.

00:55:17Do you still use post-it notes

00:55:19instead of these new sophisticated applications

00:55:21on all imaginable devices?

00:55:23Welcome to the club!

00:55:25Whatever you use,

00:55:27they always end up falling.

00:55:29If you've already encountered this problem,

00:55:31it's because you took them off

00:55:33from the bottom up.

00:55:35It's this way of doing things

00:55:37that makes it easier

00:55:39for you to remember

00:55:41your daily tasks.

00:55:43Did you know that cans

00:55:45were invented only 50 years

00:55:47after cans became commonplace?

00:55:49So how was it possible

00:55:51to open a can before?

00:55:53There are a few alternative methods

00:55:55in case you missed

00:55:57your can opener.

00:55:59All you need is a metal spoon.

00:56:01Place the can on the worktop,

00:56:03hold it firmly

00:56:05and rub the edge of the lid

00:56:07on a small surface.

00:56:09It takes time,

00:56:11but by rubbing,

00:56:13a small notch is formed

00:56:15and soon turns into a hole.

00:56:17Once the hole is wide enough

00:56:19to let the tip of the spoon through,

00:56:21put a lever on the lid

00:56:23and continue to lengthen the edges

00:56:25until you can finally access

00:56:27the meal it contains.

00:56:29You've earned it!

00:56:31Most toilets depend on

00:56:33the pressure of the water

00:56:35and the gravity to operate.

00:56:37A power failure won't affect them.

00:56:39But if yours need electricity

00:56:41to operate, you should worry

00:56:43about their use in case of a power failure.

00:56:45The good news is that electricity

00:56:47is only used to fill the toilets

00:56:49and not to flush.

00:56:51As the water flush mechanism

00:56:53still works, open the toilet tank,

00:56:55pour a few liters

00:56:57and you'll be able to flush

00:56:59everything you need.

00:57:01Flushing the shower

00:57:03takes a long time.

00:57:05It's unavoidable.

00:57:07We lose 50 to 100 hairs a day

00:57:09and many of them try to stay

00:57:11in our shower canals.

00:57:13Hair is the main source

00:57:15of obstruction,

00:57:17which encourages the accumulation

00:57:19of various other things.

00:57:21A good trick is to use your vacuum

00:57:23and put the tip in the hole

00:57:25after removing the grid.

00:57:27Use a damp cloth around the tip

00:57:29so that the vacuum can suck

00:57:31the things obstructing much more easily.

00:57:33This way you'll avoid the plumber's

00:57:35costs who use this technique themselves.

00:57:37To make your candles last longer,

00:57:39cut their wick several times

00:57:41and keep them as far away

00:57:43from water and humidity as possible.

00:57:45This will ensure that the wax

00:57:47of your candle stays firm and stable

00:57:49and that it continues to burn

00:57:51more slowly for a longer period.

00:57:53The empty space between the windows

00:57:55of the oven door is there

00:57:57for a good reason.

00:57:59You can slide a brush in there

00:58:01to clean the window of the oven door.

00:58:03It's easy to access this space

00:58:05from the bottom of the door.

00:58:07Open the lower part

00:58:09and push the brush into the hole.

00:58:11When you park in a garage,

00:58:13you may have trouble

00:58:15determining how far you should be.

00:58:17All cars are not equipped

00:58:19with sensors that ensure

00:58:21that you keep the right distance

00:58:23before the bumper

00:58:25is removed from the wall.

00:58:27We've all been told

00:58:29to unlock a lock

00:58:31with WD-40 or lubricant.

00:58:33Yes, we all know

00:58:35that we should have some at home.

00:58:37But if you don't have any,

00:58:39an excellent alternative

00:58:41is to draw a line

00:58:43along the edges of the key

00:58:45with a gray pencil

00:58:47and then insert it into the lock.

00:58:49Keep doing this until

00:58:51the lock hole is lubricated

00:58:53and the key works without any problems.

00:58:55Tweezers are likely to damage

00:58:57the taps and shower heads

00:58:59when you use them to repair them

00:59:01and they are also difficult to grab.

00:59:03So take two pieces

00:59:05from the end of an old watering pipe

00:59:07and attach them to the jaw of the tweezer.

00:59:09You'll see a huge improvement

00:59:11in grip and you'll avoid

00:59:13the risk of wear.

00:59:15You can find a good use

00:59:17of used rubber

00:59:19for different things in the house.

00:59:21If you think you have enough

00:59:23to tighten or loosen a screw

00:59:25with a screwdriver,

00:59:27try using a simple piece of rubber.

00:59:29Place a piece in the handle

00:59:31of the screwdriver

00:59:33and it will have a much better grip.

00:59:35Moving cement blocks

00:59:37is not safe for the bottom of the back.

00:59:39Even with a drill,

00:59:41it can be risky to drop the cement

00:59:43on the ground without damaging it.

00:59:45Three simple cylinder-shaped pipes

00:59:47can make all the difference,

00:59:49so try lifting the edge

00:59:51of the first pipe with a lever,

00:59:53then push and move it

00:59:55by gradually moving the three pipes

00:59:57to the desired place.

00:59:59Just make sure you don't do it

01:00:01in a slope.

01:00:03The first time you hit a nail,

01:00:05it can be a big success

01:00:07or you get hit by a really sharp nail.

01:00:09A hair clip has the perfect shape

01:00:11to keep the nail in place,

01:00:13which allows your hand to be safe

01:00:15and to hit the nail without fear.

01:00:17Use a pencil or a pencil

01:00:19when working with a circular saw

01:00:21to make sure the marks are not erased.

01:00:23They will also be easier to see

01:00:25under the water.

01:00:27Checking the pipes on the roof

01:00:29and determining when they need to be cleaned

01:00:31can take a lot of time.

01:00:33Using tape,

01:00:35attach a mirror to the end of a broom

01:00:37and check if the gutters

01:00:39need to be cleaned.

01:00:41To help you keep your balance

01:00:43when examining the gutters,

01:00:45you can use a ladder.

01:00:47The distance between the shoe

01:00:49and its grip will ensure

01:00:51an additional level of safety.

01:00:53Liquid gutter products

01:00:55are usually in the form of huge tubes

01:00:57so that you can never use them

01:00:59all at once.

01:01:01The hardened tips of the liquid

01:01:03create notches.

01:01:05Take a used lid

01:01:07and drill it to make a perfect lid

01:01:09that covers the liquid gutter.

01:01:11It is now ready to be used again

01:01:14Crackers are holes

01:01:16to prevent them from cracking

01:01:18and breaking during cooking.

01:01:20Without these holes,

01:01:22steam would accumulate in the dough

01:01:24until it burst.

01:01:26If you look at the capsule

01:01:28of a soda bottle,

01:01:30you will notice that there is

01:01:32a plastic disc inside.

01:01:34It is used to seal the liquid

01:01:36and the gases so that the drink

01:01:38remains sparkling.

01:01:40The long neck of the bottle

01:01:42is used to keep the bottle warm.

01:01:44It is difficult to see the dishes

01:01:46when they are in the microwave oven

01:01:48because of this black gray

01:01:50on the glass.

01:01:52But if it is there,

01:01:54it is to prevent the harmful

01:01:56waves from escaping.

01:01:58It acts like a shield of Faraday.

01:02:00It is used to protect you

01:02:02while ensuring adequate cooking

01:02:04of the food.

01:02:06Some products,

01:02:08such as chips packets,

01:02:10are made of air,

01:02:12and yet it is quite the opposite.

01:02:14Oxygen, the gas we breathe

01:02:16in contact with the chips,

01:02:18would induce a reaction

01:02:20that would make them quickly rust.

01:02:22This phenomenon, called oxidation,

01:02:24bears its name.

01:02:26Nitrogen, on the other hand,

01:02:28is an inert gas that keeps

01:02:30the food and prevents it from

01:02:32damaging during transport.

01:02:34Chips wrapped in an air cushion

01:02:36remain crispy and do not risk

01:02:38the interior being cooked uniformly.

01:02:40Before the addition of holes,

01:02:42the interior was generally greasy

01:02:44and doughy, and the edges were crispy.

01:02:46Marks on paper sheets

01:02:48are not used to write

01:02:50dates or lists of numbers.

01:02:52They were originally added

01:02:54to fulfill a protection function.

01:02:56At the time, rats were a real problem

01:02:58in houses, and paper

01:03:00was one of their favorite baits.

01:03:02Marks acted as a security

01:03:04device.

01:03:06Rats would rather nibble on the white paper

01:03:08that encircled the part intended

01:03:10for writing.

01:03:12This hole in the stem of your chewing gum

01:03:14is not there to prevent choking

01:03:16in case of ingestion.

01:03:18It is actually used to keep the candy in place.

01:03:20The confectionery in water

01:03:22enters the hollow of the stick,

01:03:24and once solidified,

01:03:26it holds the chewing gum.

01:03:28In this process, it would be more fragile

01:03:30and would come off easily.

01:03:32Vacuum cleaners have a lot of accessories,

01:03:34like this long brush.

01:03:36It is useful for dusting,

01:03:38and its shape is perfectly adapted

01:03:40for cleaning frames, curtains,

01:03:42or windowsills.

01:03:44What is the difference between a wooden belt

01:03:46and a plastic belt?

01:03:48Not only does a cedar wooden belt

01:03:50give the shape of clothes,

01:03:52but it also repels mites and other insects.

01:03:54Salt is not only useful in the kitchen.

01:03:56It can get rid of strong odors.

01:03:58Rubbing salt on your fingers

01:04:00after chopping garlic should

01:04:02remove the odors,

01:04:04and it also works for shoes.

01:04:06The breadcrumbs have a secret drawer

01:04:08in the bottom that can be removed

01:04:10to clean all these annoying

01:04:12little crumbs of bread.

01:04:14If you can't get a chocolate out of the box,

01:04:16look at these little holes right next to it.

01:04:18They are there to help you.

01:04:20If you press one of these holes,

01:04:22the chocolate will easily come out of its notch.

01:04:24When you drink a sip of coffee

01:04:26in a cup with a lid,

01:04:28the pressure in the cup decreases

01:04:30when you drink it.

01:04:32The little hole on the lid

01:04:34allows the air to circulate

01:04:36and the drink can flow smoothly

01:04:38through the main opening.

01:04:40And it's not over.

01:04:42The little pressures on the top

01:04:44of these lids

01:04:46are used to inform the staff

01:04:48as well as the customers

01:04:50about the contents of the cups

01:04:52in order to differentiate them.

01:04:54There is a legend about

01:04:56each little crumb.

01:04:58If there are four numbers,

01:05:00the first one is a 4 or a 3,

01:05:02the fruit has been treated

01:05:04with pesticides.

01:05:06If there are five numbers,

01:05:08the first one is an 9.

01:05:10It is from organic farming.

01:05:12If there are five numbers,

01:05:14the first one is an 8,

01:05:16it has undergone genetic modifications.

01:05:18When you are on your way to your car

01:05:20after finishing and packing all your shopping,

01:05:22remember to use the hooks on the cart

01:05:24to hang the bags.

01:05:26The most fragile items,

01:05:28such as bread, eggs or fruits and vegetables,

01:05:30will not be crushed by the heavier products.

01:05:32If you have no one with you

01:05:34to help you hold your tape measure,

01:05:36while you are trying to measure something,

01:05:38you just have to nail it.

01:05:40Place your nail at the level

01:05:42of the small dedicated hole

01:05:44where the tape measures are usually placed

01:05:46and you just have to unroll it.

01:05:48The McFlurry square spoon

01:05:50is designed to easily mix

01:05:52the fillings with the ice.

01:05:54You just have to turn it

01:05:56and it starts to spin.

01:05:58The padlocks used outside

01:06:00suck quickly because of the rain.

01:06:02You see this little hole down there?

01:06:04It is used to pour engine oil.

01:06:06This trick allows you to lubricate the mechanism

01:06:08and the key should spin again without effort.

01:06:10It's been two hours since you've been tapping

01:06:12on the bottom of the ketchup bottle

01:06:14but nothing comes out.

01:06:16Here's a little trick.

01:06:18Put the bottle diagonally

01:06:20and tap in the middle of the neck.

01:06:22You can also use ketchup or mustard.

01:06:24Ready for the scoop?

01:06:26These little ramekins are actually

01:06:28supposed to unfold to become

01:06:30real little paper plates

01:06:32that can hold a lot more sauce.

01:06:34The little hole on the handle

01:06:36of the pans or pans

01:06:38is not only used to hang them on the wall.

01:06:40While you cook,

01:06:42place the end of the utensil handle

01:06:44that you are using in this hole.

01:06:46It will be held above the preparation

01:06:48that is being cooked

01:06:50The colored hairs of a toothbrush

01:06:52are there to tell us when

01:06:54it is necessary to change them.

01:06:56If you notice that these hairs

01:06:58are considerably pale,

01:07:00change toothbrush or just your head

01:07:02depending on the case.

01:07:04The upper hole of the sink

01:07:06has many functions.

01:07:08First, it prevents water from overflowing

01:07:10if someone forgets to close the tap.

01:07:12It also allows water to evaporate faster

01:07:14allowing the air to escape while the water flows.

01:07:16Most of the Metallic light closures

01:07:18have a hidden lock system

01:07:20that can save you from awkward moments

01:07:22like an open bracket.

01:07:24Don't let the strap go up.

01:07:26If you lower the strap,

01:07:28the closure locks automatically.

01:07:30All thanks to these little notches

01:07:32placed under the tongue.

01:07:34Perimetal milk produces gases

01:07:36like most perimetal foods.

01:07:38Some plastic milk cans

01:07:40have a concave part on one side.

01:07:42If the milk spins and produces gases,

01:07:44this part of the bottle will inflate

01:07:46The same thing will happen

01:07:48if you put the can in the freezer.

01:07:50The solidified milk takes up more space

01:07:52than in liquid form.

01:07:54The foam bath is not only made

01:07:56to have fun and feel good.

01:07:58It also regulates the temperature.

01:08:00The bubbles maintain the heat of the water

01:08:02and you can enjoy your bath longer.

01:08:04However, this only works

01:08:06for acrylic baths.

01:08:08These are made of metal,

01:08:10losing heat quickly in all cases.

01:08:12Many cups and mugs

01:08:14are designed for dishwashers.

01:08:16They allow water to flow

01:08:18and thus avoid getting everywhere

01:08:20when leaving the dishwasher.

01:08:22These grooves allow air to flow

01:08:24so that the cup does not crack

01:08:26even if the tea is boiling.

01:08:28The small tips in the cream tube caps

01:08:30are also useful.

01:08:32Most of the tubes are sealed

01:08:34with aluminum,

01:08:36impossible to pierce without saying goodbye to your nails.

01:08:38These tips open all the cream tubes,

01:08:40even the most resistant ones.

01:08:42The escalator brushes are not used

01:08:44to clean and polish your shoes.

01:08:46Applying wax on a moving escalator

01:08:48can be complex.

01:08:50These brushes are there for safety reasons,

01:08:52preventing users

01:08:54from approaching the edge of the steps.

01:08:56They reduce the risk

01:08:58that the bottom of a long coat

01:09:00or an empty pair of pants

01:09:02gets stuck between the steps.

01:09:04All tic-tac boxes are designed

01:09:06to make only one tic-tac come out at a time.

01:09:08The lid has the same shape as the candy.

01:09:10To open the box,

01:09:12gently shake it and open it.

01:09:14You will see that there is only one candy

01:09:16in the lid hole.

01:09:18If you usually shake the box

01:09:20until it falls directly into your mouth,

01:09:22then you do not know how to eat tic-tacs.

01:09:24Originally, the pompom on the caps

01:09:26was not just a fashion accessory.

01:09:28It prevented sailors

01:09:30from hitting their heads

01:09:32on the typically very low ceilings of ships.

01:09:34There are a multitude of amazing things

01:09:36that you can do with products

01:09:38such as pompoms.

01:09:40We will explore some of these possibilities

01:09:42as well as everyday articles

01:09:44that fill other functions

01:09:46that you may be far from aware of.

01:09:50Many kitchen scissors

01:09:52have a lace opening

01:09:54where the handles and blades meet.

01:09:56You can use it to peel

01:09:58difficult herbs like thyme,

01:10:00rosemary and chives.

01:10:02It saves you time

01:10:04trying to remove the leaves by hand.

01:10:06And if you are short of vases,

01:10:08you can offer roses

01:10:10to those you love in this way.

01:10:12Just be careful where you point

01:10:14the tip of the scissors.

01:10:16The metallic tongue

01:10:18of soda cans can be turned

01:10:20so that you can slip a straw

01:10:22and thus avoid carrying the can

01:10:24in your mouth.

01:10:26This tongue also replaced

01:10:28the traction ring created

01:10:30at the beginning of the 60s.

01:10:32You remember the latter, don't you?

01:10:34Now you can slip your straw

01:10:36directly into the tongue

01:10:38and also make bubbles.

01:10:42Sometimes when you buy

01:10:44a new garment,

01:10:46a small plastic bag is attached

01:10:48with an extra button

01:10:50and a piece of fabric.

01:10:52If the fabric is often used

01:10:54to repair any holes,

01:10:56it can also be used

01:10:58to test the effects

01:11:00of various detergents.

01:11:02You can use a screwdriver

01:11:04to make a lever

01:11:06if you have trouble lifting

01:11:08or moving something.

01:11:10Some also have a hexagonal

01:11:12handle that fits

01:11:14inside a wrench.

01:11:16You can use it

01:11:18to increase the tightening

01:11:20and, once again,

01:11:22make a lever.

01:11:24Practical for those

01:11:26who don't have much strength

01:11:28in their arms.

01:11:30This tool is useful

01:11:32for many things,

01:11:34but if you have a bottle

01:11:36or a jar that's hard to open,

01:11:38you can wrap the elastic

01:11:40around the plug

01:11:42for a better grip.

01:11:44Mechanical stairs

01:11:46have black brushes

01:11:48on the sides,

01:11:50for the same reason

01:11:52that there are sometimes

01:11:54yellow lines on the steps,

01:11:56to dissuade people

01:11:58from stepping on the floor

01:12:00or the skirt.

01:12:02The brush is a little safety

01:12:04to prevent that from happening.

01:12:06It can also prevent

01:12:08pieces of plush

01:12:10or other small items

01:12:12from falling into the gaps.

01:12:14Your jeans have several

01:12:16features that are very functional,

01:12:18although a little out of style.

01:12:20The metal rivets

01:12:22around the pockets

01:12:24help secure the tension points.

01:12:26The small pockets

01:12:28are placed directly

01:12:30above the main pocket.

01:12:32Originally,

01:12:34it was intended

01:12:36to contain a watch.

01:12:38Even though most

01:12:40of these watches

01:12:42belong to the past,

01:12:44many people still use

01:12:46this space to store

01:12:48coins, a ring

01:12:50or even a mini USB key.

01:12:52It may seem a little obvious,

01:12:54but they are also a good indicator

01:12:56of the wear of your tire.

01:12:58If these grooves are no longer

01:13:00as deep and they almost

01:13:02cover the road,

01:13:04it's time to change your tires.

01:13:06If you don't,

01:13:08the next time you try

01:13:10to stop suddenly at a red light,

01:13:12you may be surprised

01:13:14to see that your car

01:13:16has turned into a giant roller coaster.

01:13:18These boxes to be carried

01:13:20are often associated

01:13:22with refrigerators.

01:13:24They also serve as plates

01:13:26because you can eat directly

01:13:28in them without worrying

01:13:30about the dirty dishes.

01:13:32They were patented in 1894

01:13:34to transport freshly

01:13:36chopped oysters

01:13:38and were known as

01:13:40oyster buckets.

01:13:42They were then adapted

01:13:44to be used as

01:13:46food containers.

01:13:48When you're sitting in a plane

01:13:50you can see a little hole

01:13:52or, in some cases,

01:13:54a singular opening at the bottom.

01:13:56It's called an air hole

01:13:58and it's designed to equalize

01:14:00the difference in air pressure

01:14:02that accumulates between

01:14:04the pressurized cabin

01:14:06and the outside atmosphere,

01:14:08especially at high altitudes.

01:14:10It also releases moisture

01:14:12between the windows

01:14:14to prevent frost from forming

01:14:16on the windows

01:14:18Sorry, but you won't be able

01:14:20to draw a smiley face right away!

01:14:22The first cutter

01:14:24was introduced in 1956

01:14:26by a Japanese company.

01:14:28They were inspired

01:14:30by the squares of chocolate

01:14:32tablets.

01:14:34Almost all measuring ribbons

01:14:36have an empty slot

01:14:38in their metallic ends.

01:14:40It's called a nail clip

01:14:42and you can attach it

01:14:44to a nail or a screw.

01:14:46It's a practical way

01:14:48to measure without needing

01:14:50anyone else to hold it in place.

01:14:52Hair clips have grooves

01:14:54on one of the branches

01:14:56to better hold your hair in place.

01:14:58The straight side

01:15:00should be at the top

01:15:02while the grooves should be

01:15:04against your head.

01:15:06They're also called bob clips

01:15:08because of the bob hairstyle,

01:15:10which is the square cut

01:15:12that was popular in the 1920s

01:15:14and the fact that hair clips

01:15:16were invented in the 19th century.

01:15:18Don't forget to remove them

01:15:20before washing your hair!

01:15:22If you've ever noticed

01:15:24the textured black dots

01:15:26on the windshield of a car

01:15:28or a bus,

01:15:30you've probably realized

01:15:32that it's not meant for decoration.

01:15:34It's called a fritz

01:15:36and it's a ceramic paint.

01:15:38Its main purpose

01:15:40is to protect the window

01:15:42from getting caught.

01:15:44If you see a piece of pink adhesive

01:15:46in a corner,

01:15:48don't touch it.

01:15:50It's probably someone's old chewing gum.

01:15:52If you take a look

01:15:54at the bottom of a lock,

01:15:56there's a good chance

01:15:58you'll see one or two little holes.

01:16:00They're used to evacuate the water

01:16:02trapped inside because of the rain.

01:16:04This mini drainage system

01:16:06prevents the interior

01:16:08from rusting or freezing

01:16:10if it's very cold.

01:16:12And if the lock gets stuck,

01:16:14you can get a product

01:16:16with oil inside

01:16:18to lubricate it

01:16:20and make it work again.

01:16:22If you've lost the key

01:16:24and you want to ease your frustration,

01:16:26you can scream in the holes.

01:16:28It won't open it,

01:16:30but you'll feel a little better.

01:16:32Some shirts

01:16:34have a fabric buckle

01:16:36in the collar.

01:16:38If you want to hang the shirt,

01:16:40the buckle would have been used

01:16:42for the first time in the Navy

01:16:44because it was easy

01:16:46to simply hang them on the wall.

01:16:48In the 1960s,

01:16:50the fashion was to wear

01:16:52the buttoned shirt up to the top,

01:16:54which made everything more complicated.

01:16:56So designers started

01:16:58to put the buckle in the back.

01:17:00If the student took off the buckle,

01:17:02it meant they were in a stable relationship.

01:17:04Unless one of his friends

01:17:06took it off

01:17:08to make a joke out of him.

01:17:10And now, everyone wonders

01:17:12who he's dating.

01:17:16Have you ever wondered

01:17:18why coins have these little

01:17:20grooves on the edges?

01:17:22It's a vestige of the old days

01:17:24where they were more valuable.

01:17:26Scammers could easily file the edges

01:17:28of coins to make new ones

01:17:30out of gold or silver.

01:17:32The grooves were created

01:17:34to make it easier to tell

01:17:36if a piece has been filed.

01:17:38It's no longer necessary today,

01:17:40but pieces always have this detail.

01:17:42And if you ever get bored,

01:17:44you can try to count

01:17:46the number of grooves.

01:17:48Or you can watch

01:17:50another nice video.

01:17:52Listen to this.

01:17:54Over the past centuries,

01:17:56manufacturers have started

01:17:58to add grooves on the edges

01:18:00of coins to fight against

01:18:02coins and use the metal

01:18:04obtained to strike new coins.

01:18:06But with the grooves,

01:18:08it's now impossible

01:18:10to hide a missing piece.

01:18:12These little cylinders

01:18:14on the charging cables

01:18:16are called selfs

01:18:18or ferrite cores.

01:18:20They're made of magnetic

01:18:22iron oxide to prevent

01:18:24electromagnetic interference.

01:18:26In other words,

01:18:28they protect your device

01:18:30and help to hold

01:18:32the material together.

01:18:34Manufacturers put these buttons

01:18:36where the jeans can tear

01:18:38during movement or tension.

01:18:40These little holes on some

01:18:42backpacks were designed

01:18:44to attach additional equipment.

01:18:46So you can put laces

01:18:48and baskets on them

01:18:50if you don't want to put

01:18:52them in your backpack

01:18:54or have to carry them

01:18:56by hand.

01:18:58Your Mac's Spotlight function

01:19:00can be used not only

01:19:02for quick file and app search

01:19:04but also as a calculator.

01:19:06All you have to do is type

01:19:08a mathematical operation

01:19:10that you have to solve.

01:19:12Spotlight also uses

01:19:14internal dictionary data.

01:19:16Grab any word in the search

01:19:18bar and you'll get

01:19:20information about it.

01:19:22You've just bought

01:19:24a new bottle of oil?

01:19:26Don't throw it in the bin.

01:19:28Put it back upside down

01:19:30to control the flow

01:19:32by pressing your finger on it.

01:19:34The tiny spots on the keys

01:19:36F and J of the keyboard

01:19:38help your fingers to navigate

01:19:40on this one during the strike.

01:19:42When your indexes are on these spots,

01:19:44you know exactly where

01:19:46the other letters are.

01:19:48The brushes on the sides

01:19:50of the escalators

01:19:52are not used to tighten

01:19:54the wheels of the escalators

01:19:56which is not good news.

01:19:58Most American door handles

01:20:00are made of brass.

01:20:02This type of metal is effective

01:20:04against microbes because

01:20:06bacteria can't multiply

01:20:08as much on such surfaces.

01:20:10That's why public toilets

01:20:12don't offer total privacy.

01:20:14The space under the door

01:20:16is designed to make you want

01:20:18to get out of there as soon as possible.

01:20:20Thanks to this design,

01:20:22you can use a plastic soda can

01:20:24as a glass bottom.

01:20:26It has the perfect shape

01:20:28to hold your drink

01:20:30and prevent the surface

01:20:32of a table from being wet.

01:20:34Don't turn the lid upside down.

01:20:36Just place it on the table

01:20:38the same way it was on the can.

01:20:40If you're stuck in a car

01:20:42during an accident

01:20:44and you can't open the doors,

01:20:46you can use the removable

01:20:48cup holders to break the glass

01:20:50so you can keep the soda

01:20:52in a sparkling state.

01:20:54You've probably seen food

01:20:56heated in a microwave

01:20:58at least once in your life.

01:21:00Yes, it's exciting.

01:21:02But why did the designers

01:21:04make the doors so dark?

01:21:06This black gray is necessary

01:21:08to block electromagnetic fields.

01:21:10The tiny dots on the locks

01:21:12next to the lock hole

01:21:14are designed to evacuate moisture

01:21:16if water enters inside.

01:21:18Pour oil through this hole

01:21:20to solve the problem.

01:21:22The golf balls are covered

01:21:24with tiny craters

01:21:26for better aerodynamics.

01:21:28They're called faucets

01:21:30and this design helps the ball

01:21:32fly further and more stably.

01:21:34Some cups have a small groove

01:21:36below the bottom.

01:21:38It helps water to flow

01:21:40and prevents it from accumulating

01:21:42when the cup is in the dishwasher.

01:21:44At first, sunglasses were not

01:21:46very popular in the Arctic.

01:21:48A huge amount of snow

01:21:50can blind you,

01:21:52just like a flashlight.

01:21:54To protect your eyes,

01:21:56unique glasses were invented.

01:21:58You can use any T-shirt

01:22:00not only to dress up

01:22:02but also as a protective layer

01:22:04for your luggage.

01:22:06Just put your clothes

01:22:08around your suitcase

01:22:10and you don't waste time

01:22:12or money packing it in plastic.

01:22:14Nowadays, ties are thinner

01:22:16but this button is still

01:22:18decorative.

01:22:20Here is the first function

01:22:22of the tie.

01:22:24It was created in Europe

01:22:26in the 17th century

01:22:28to tighten the collar.

01:22:30This way, people protected

01:22:32their neck from the strong wind.

01:22:34Then, they got used

01:22:36to this part of the suit

01:22:38and made it an essential

01:22:40accessory of the bourgeoisie.

01:22:42Many ties are made

01:22:44of cedar wood

01:22:46because it contains

01:22:48many natural oils

01:22:50that repel mites

01:22:52that eat your clothes.

01:22:54The spherical shape

01:22:56of the bulbs

01:22:58allows the light

01:23:00to spread evenly.

01:23:02In addition, such bulbs

01:23:04are cheaper and easier to make.

01:23:06Have you ever found these pieces

01:23:08of fabric in new clothes?

01:23:10You can put this piece

01:23:12in the washing machine

01:23:14and see what happens to it.

01:23:16If everything goes well,

01:23:18you can wash your clothes

01:23:20without any risk.

01:23:22Your ceiling fan

01:23:24has two modes of operation,

01:23:26summer and winter.

01:23:28You have to find the switch

01:23:30that is on it.

01:23:32Push it up to activate

01:23:34the winter mode

01:23:36and down for the summer mode.

01:23:38Some people have a round fan

01:23:40in their bathroom.

01:23:42In the movies,

01:23:44they use it to flush the toilets.

01:23:46In reality,

01:23:48it is used to flush the sink.

01:23:50For the toilets,

01:23:52you have to use

01:23:54another special tool.

01:23:56The drawer under your oven

01:23:58is not used to store pans

01:24:00and pans.

01:24:02You can put dishes

01:24:04that will be kept warm

01:24:06after you have heated them.

01:24:08You see this little hole

01:24:10at the top of the bag?

01:24:12You can use it to get rid

01:24:14of small unbroken grains.

01:24:16Shake the package

01:24:18over a plate

01:24:20and all the grains

01:24:22will fall through the hole.

01:24:24Almost everyone

01:24:26uses the travel pillows

01:24:28incorrectly.

01:24:30In general,

01:24:32you put the two ends

01:24:34and this position

01:24:36will be much more comfortable

01:24:38for your neck

01:24:40and you will have a good nap.

01:24:42We create magnets

01:24:44in the shape of horseshoes

01:24:46to increase their magnetic power.

01:24:48The blue part indicates

01:24:50the south pole

01:24:52and the red part

01:24:54the north pole.

01:24:56The two poles

01:24:58work simultaneously

01:25:00and increase traction.

01:25:02Roger Bacon

01:25:04made the first mention

01:25:06of the use of telescope lenses

01:25:08for optical purposes.

01:25:10At that time,

01:25:12magnifying lenses

01:25:14were popular

01:25:16for reading in Europe

01:25:18and China.

01:25:20So we still wonder

01:25:22whether the West

01:25:24stole the idea

01:25:26from the East

01:25:28or vice versa.

01:25:30You can use your laces

01:25:32as fishing lines.

01:25:34Tie the fish

01:25:36and throw it in the water.

01:25:38Good luck

01:25:40to catch the fish

01:25:42that swallowed your phone.

01:25:44It will be a big fish.

01:25:46You can turn

01:25:48the tongue

01:25:50of the soda can

01:25:52and use it

01:25:54to hold a straw in place.

01:25:56The blue part

01:25:58is perfect for this task.

01:26:00Most of us

01:26:02detach post-its incorrectly.

01:26:04Try to do it

01:26:06not from the bottom

01:26:08but from the side

01:26:10along the glue line.

01:26:12Your post-it will stay

01:26:14glued to the wall

01:26:16for a longer time.

01:26:18Have you ever wondered

01:26:20what these two holes

01:26:22in the laces stick for?

01:26:24Well, when you put the stick

01:26:26in the glue line,

01:26:28the glue will stick

01:26:30to the post-it.

01:26:32Today, I'll show you

01:26:34things you've never seen

01:26:36and tell you things

01:26:38you didn't know.

01:26:40Wow! All in one video?

01:26:42What luck!

01:26:44For example,

01:26:46these fountain stations

01:26:48in fast food.

01:26:50We all think they're great

01:26:52but have you ever wondered

01:26:54what happens when you

01:26:56take a drink out of a can

01:26:58and put it back in?

01:27:00Well, let's take a look

01:27:02at other places

01:27:04where we're not supposed

01:27:06to be.

01:27:08Here's what you'll see

01:27:10if you open a Mac.

01:27:12And here's what's hidden

01:27:14behind the dryers

01:27:16of a washing machine.

01:27:18Today, 4 out of 5 households

01:27:20in the U.S. have a laundry dryer

01:27:22and it's way too expensive

01:27:24for the average consumer.

01:27:26Shopping is a common practice

01:27:28and we've all been in front

01:27:30of a fridge a million times

01:27:32to buy dairy products.

01:27:34But have you ever wondered

01:27:36what's behind it?

01:27:38It turns out it's just shelves

01:27:40and the shop employees

01:27:42stack the products on the other side.

01:27:44It's logical, but I never imagined

01:27:46things like that.

01:27:48This photo shows what's

01:27:50hidden behind the shelves.

01:27:52The buttons are all connected

01:27:54to a computer that controls

01:27:56the elevator.

01:27:58How does the computer

01:28:00get there?

01:28:02There are several ways

01:28:04to get there.

01:28:06The most common way

01:28:08is a long vertical ribbon

01:28:10with a series of holes.

01:28:12A sensor counts the number

01:28:14of holes that have passed

01:28:16and that's how the location

01:28:18of the holes is determined.

01:28:20Let me share these secrets with you.

01:28:22These metal ribbons

01:28:24have been around

01:28:26since the very beginning.

01:28:28Jacob Davis, the legendary man

01:28:30who made the first pair of jeans,

01:28:32added leather ribbons

01:28:34to the places where

01:28:36pants are more likely

01:28:38to tear.

01:28:40Today, they have a more

01:28:42decorative and distinctive purpose

01:28:44as they are a traditional

01:28:46decoration.

01:28:48These holes are for the laces,

01:28:50just like the other holes

01:28:52you use.

01:28:54They are there to fix

01:28:56your shoe around the ankle

01:28:58to prevent your foot

01:29:00from moving inside.

01:29:02It's particularly useful

01:29:04if you are hiking

01:29:06and you go up and down

01:29:08hills and trails.

01:29:10Have you noticed

01:29:12these half-belts that

01:29:14you can wear while working?

01:29:16Today, these belts are only

01:29:18added for style and tradition.

01:29:20Most of the clothes you buy

01:29:22are delivered with a small

01:29:24piece of fabric or a button

01:29:26or both.

01:29:28These elements are not useless.

01:29:30The buttons, of course,

01:29:32can be used to replace

01:29:34what is lost.

01:29:36The pieces of fabric

01:29:38are useful for two things.

01:29:40You can make a hole

01:29:42and see what happens.

01:29:44Now, the pompoms

01:29:46on wool hats.

01:29:48Did you know that sailors

01:29:50wore hats with pompoms

01:29:52in the 18th century

01:29:54to protect their heads

01:29:56in case they were hit accidentally?

01:29:58The people of the street

01:30:00wore them in Scotland

01:30:02and the color of the pompom

01:30:04indicated the social status

01:30:06of the person.

01:30:08People started wearing pompoms

01:30:10to protect their heads.

01:30:12You may have noticed

01:30:14that some sidewalks

01:30:16have signs with bumps.

01:30:18Most people don't pay

01:30:20much attention to them,

01:30:22but they are very important

01:30:24for visually impaired people.

01:30:26They indicate a slope

01:30:28that then leads to a pedestrian

01:30:30crossing.

01:30:32Moreover, several patterns

01:30:34indicate various elements.

01:30:36Did you notice that the icon

01:30:38indicates where the gas tank is?

01:30:40It is very useful for distracted people

01:30:42who constantly wonder

01:30:44where they are.

01:30:46And also for those

01:30:48who drive rental cars from time to time.

01:30:50The answer is right in front of you.

01:30:52If you don't find the arrow

01:30:54on your sign,

01:30:56the gas pipe on the icon

01:30:58indicates the side in place.

01:31:00On the back of many make-up

01:31:02and hygiene products,

01:31:04you can find this symbol

01:31:06It is the number of months

01:31:08that this product can be used

01:31:10before you have to throw it away.

01:31:12You may know that whistles

01:31:14work perfectly

01:31:16even if they don't have

01:31:18this little ball inside.

01:31:20And yet they do.

01:31:22But why?

01:31:24Even if the whistle

01:31:26produces a sound without the ball,

01:31:28it is quite neutral

01:31:30and is not noticed enough.

01:31:32When the whistle contains a ball,

01:31:34it is not for nothing

01:31:36that the whistle sticks

01:31:38have these square holes at their ends.

01:31:40When the ball is placed on the stick,

01:31:42a part of the stick enters the hole,

01:31:44thus fixing the part of the ball.

01:31:46In this way, the ball

01:31:48or any other shape

01:31:50is less likely to detach from the stick.

01:31:52Because yes, it's terrible when it happens.

01:31:54The ribbons to measure have this metal cap

01:31:56at the end.

01:31:58Most people know that you can use it

01:32:00to stick it on the side of the surface you measure.

01:32:02But it's not the only cool thing about it.

01:32:04Look, there is also a small slit.

01:32:06This slit can be used

01:32:08to hang it on a nail.

01:32:10Once again to free your hands

01:32:12and continue to measure.

01:32:14The bottom of the end of the ribbon

01:32:16has a rounded edge.

01:32:18It will help you to make a mark

01:32:20if you don't have a marking tool with you.

01:32:22Have you ever wondered

01:32:24why the blade of the ribbon is curved?

01:32:26Well, it keeps it inclined

01:32:28when deployed.

01:32:30Here are the black lozenges.

01:32:32These are present every 48.8 cm.

01:32:34And they are useful to the workers

01:32:36of the building

01:32:38to space the engineering beams.

01:32:40They can also be useful

01:32:42if you want to suspend something heavy, for example.

01:32:44The diamond will mark the exact center

01:32:46of a cap which is placed

01:32:4840 cm from each other.

01:32:50And you can drill something

01:32:52in this center to make sure

01:32:54that what you hang is well fixed.

01:32:56Most coin pieces

01:32:58have stripes.

01:33:00And it's the heritage of the old days.

01:33:02You see, at the time, all coin pieces

01:33:04were linked to a silver standard.

01:33:06The amount of silver used in a piece

01:33:08was proportional to the value of the piece.

01:33:10So, the more silver there was

01:33:12in the manufacturing of the piece,

01:33:14the more value it had.

01:33:16Hi-ho, silver!

01:33:18Do you remember the lonely ranger?

01:33:20Silver was the name of his horse.

01:33:22But forget it.

01:33:24Anyway, all coin pieces contained precious metal

01:33:26and a few people started to deny a little bit of silver.

01:33:30This was not seen on a single piece,

01:33:32but if it was done on several,

01:33:34people could recover a good part of the precious metal.

01:33:36So, to avoid frauds,

01:33:38the edges were equipped with crests

01:33:40as a security measure.

01:33:42Thus, if someone tried to rake them,

01:33:44the stripes disappeared.

01:33:46And no one wanted to accept this piece anymore.

01:33:48Clever!

01:33:50Today, as no one makes silver coin pieces,

01:33:52the pieces simply symbolize value.

01:33:54In a way, all coins are a cultural heritage.

01:33:56And finally, a typical plastic bottle

01:33:58often has inverted circles

01:34:00on one or several of its sides.

01:34:02These are not circles of extraterrestrial culture.

01:34:04This reinforcement is there

01:34:06to make the pot more resistant

01:34:08and prevent it from erupting

01:34:10in case the pot fell to the ground.

01:34:12The reinforcement gives a little more space

01:34:14to the liquid to expand.

01:34:16In addition, as the expiry date approaches,

01:34:18the microbes present in the milk

01:34:20begin to expel gases.

01:34:22As there are more and more to be trapped inside,

01:34:24the pressure in the pot increases.

01:34:26The reinforcement takes care of the expansion

01:34:28and prevents the pitcher from exploding.

01:34:30And the cows are obviously delighted

01:34:32that their hard work is not wasted.

01:34:40You are trying on a jean, a dress or a jacket

01:34:42and you are about to put your hand in the pocket

01:34:44when suddenly you realize

01:34:46that it is impossible.

01:34:48There is no pocket at all.

01:34:50But why sew pockets

01:34:52where you can't put anything?

01:34:54You can now pick up your iPhone

01:34:56on the ground.

01:34:58Well, the reason is very simple.

01:35:00Adding pockets

01:35:02on some clothes could harm

01:35:04the cut that was initially given to them.

01:35:06They can deform them in the warehouse

01:35:08or on the detailer's showcase.

01:35:10The solution?

01:35:12Get rid of the pockets

01:35:14in the key places.

01:35:16In addition, fake pockets cost much less

01:35:18and do not distance themselves.

01:35:20This curious practice

01:35:22dates back to the 17th century.

01:35:24At that time, pockets were removable.

01:35:26They were like small bags

01:35:28and women, for example,

01:35:30could pass them from one outfit to another.

01:35:32Unfortunately, it was also very practical

01:35:34for pickpockets.

01:35:36Nothing easier than taking hold of your pockets.

01:35:40Then clothes evolved

01:35:42and we started sewing thin pockets

01:35:44instead of detachable bags.

01:35:46It was thought

01:35:48that it embellished the silhouette.

01:35:50But soon,

01:35:52narrower skirts appeared

01:35:54and pockets were caught.

01:35:56People started

01:35:58using handbags instead.

01:36:00Today, most pockets are real

01:36:02but fakes have not completely disappeared.

01:36:04So how to make sure

01:36:06that our clothes have a pocket

01:36:08and that we won't find a simple hole by putting our hand in it?

01:36:10First of all,

01:36:12take a look at the seam

01:36:14on the edge of the pocket,

01:36:16where it is supposed to open.

01:36:18If you see a single loose thread,

01:36:20cut a piece and start pulling gently.

01:36:22If the pocket is real,

01:36:24the thread will come out easily.

01:36:26But if the seam does not move,

01:36:28it is very likely that it is a fake pocket.

01:36:32In this case, drop it.

01:36:36Now let's see what other everyday objects

01:36:38have a little secret.

01:36:40For example,

01:36:42chips.

01:36:44They help to distribute spices

01:36:46and seasonings.

01:36:48Basically, all these substances

01:36:50that give taste to your chips

01:36:52are retained between these lines.

01:36:54And then, they make them more crispy.

01:36:58The overlays are filled

01:37:00with a fluorescent, semi-transparent ink

01:37:02that shines under low light.

01:37:04Yellow and light green

01:37:06are the most popular

01:37:08because they allow you to see the text

01:37:10in black and white.

01:37:12The photocopiers do not detect these colors

01:37:14and the page remains clear.

01:37:18In the past, there was a problem

01:37:20with jeans.

01:37:22The workers and miners

01:37:24who were the first to wear them

01:37:26often mistreated them during their work.

01:37:28And the seams did not resist

01:37:30and tore.

01:37:32Tiny rivets in metal

01:37:34were therefore added

01:37:36to reinforce this popular garment.

01:37:38Most metal zippers

01:37:40automatically lock.

01:37:42That's why you should not let the zipper

01:37:44point up.

01:37:46When you bring it down,

01:37:48it locks, in a way.

01:37:50This is thanks to small grooves

01:37:52hidden under the zipper.

01:37:54Now let's talk about these horizontal lines

01:37:56on plastic bottles.

01:37:58It is thanks to them that the bottles stand up.

01:38:00Some bottles are made of flexible plastic.

01:38:02Without these lines,

01:38:04they would deform.

01:38:06The bath foam

01:38:08is not only used for fun or to perfume the water.

01:38:10It is also used to regulate the temperature.

01:38:12The bubbles retain the heat

01:38:14and you can enjoy your bath longer.

01:38:16With or without a plastic duck.

01:38:20Have you noticed this layer of transparent liquid

01:38:22in the gel-inked pens?

01:38:24This is called the follow-up liquid

01:38:26or the stop liquid.

01:38:28The gel of these pens contains

01:38:30dissolved pigment particles in a polymer solution.

01:38:32The gel must be thick enough

01:38:34to absorb the suspended particles

01:38:36but also fluid enough to flow

01:38:38first on the ball, then on the paper.

01:38:40The stop liquid

01:38:42prevents the gel from evaporating

01:38:44or flowing.

01:38:46Without this transparent fluid,

01:38:48your gel-inked pen would not write.

01:38:50The fluid is fixed

01:38:52and does not dissolve with the gel.

01:38:54It does not move backwards

01:38:56and does not flow out of the pen.

01:38:58The holes at the bottom of your headphones

01:39:00allow the air to flow

01:39:02and pass through the speakers.

01:39:04This increases the low frequencies

01:39:06which improves the quality of the low sounds

01:39:08and the sound quality in general

01:39:10is improved.

01:39:12Some plastic milk containers

01:39:14have holes on the sides.

01:39:16It is that they do not stop

01:39:18hitting each other.

01:39:20These holes have several functions.

01:39:22First of all,

01:39:24when the milk stops,

01:39:26it usually causes inflation

01:39:28and an increase in pressure

01:39:30on the container.

01:39:32This is when the hole is useful.

01:39:34It inflates and prevents the container

01:39:36from bursting.

01:39:38In addition, if you decide to freeze your milk,

01:39:40it will dilate like any other liquid

01:39:42and this hole will inflate

01:39:44and your bottle of milk will remain intact

01:39:46in your freezer.

01:39:48A good thing!

01:39:50Airplane shutters

01:39:52have rounded edges

01:39:54and this is very important for safety.

01:39:56This avoids accidents.

01:39:58Airplanes shutters

01:40:00are usually located in the corners.

01:40:02If the airplane shutters

01:40:04were square or rectangular,

01:40:06they would have four weak points.

01:40:08With the pressure,

01:40:10it could be catastrophic.

01:40:12If you look carefully

01:40:14at the air cables of the trams,

01:40:16you will see that they zigzag

01:40:18instead of running in a straight line.

01:40:20All trams have pantographs

01:40:22on their roofs.

01:40:24The upper part of the pantograph

01:40:26must be replaced.

01:40:28In order for them to run uniformly,

01:40:30the cables do not follow a straight line

01:40:32but zigzag.

01:40:34The tram moves forward

01:40:36and its pantograph

01:40:38runs slower.

01:40:42You may have wondered

01:40:44why some gas cans

01:40:46have two holes with caps,

01:40:48a large one and a smaller one.

01:40:50Before, I thought the small hole

01:40:52was used to pour the liquid

01:40:54and it is very rare.

01:40:56In reality,

01:40:58it must be uncovered before

01:41:00you pour your gas through the large hole.

01:41:02You will avoid it from sticking

01:41:04and spreading on the ground by accident.

01:41:06Most of the buttons

01:41:08of a shirt are vertical

01:41:10but those of the top and sometimes

01:41:12of the bottom are horizontal.

01:41:14The reason is simple.

01:41:16These two buttons slide more often than the others.

01:41:18Fortunately, the manufacturers

01:41:20have found a solution to prevent

01:41:22horizontal buttonholes.

01:41:24How ingenious!

01:41:26The buttons are less often

01:41:28exposed in this type of buttonhole.

01:41:30Sugar or salt bags are easier to open

01:41:32than we think.

01:41:34It is not necessary to tear off

01:41:36one of the ends.

01:41:38The good method is to tear them

01:41:40in the middle.

01:41:42Some boots have loops

01:41:44on the top of the heel.

01:41:46They are used to put on your shoes more easily.

01:41:48You just have to pull on the loop

01:41:50You can also use these loops

01:41:52to hang your shoes when they are dirty

01:41:54or when you want to dry them after washing.

01:41:56You can also pass your laces

01:41:58through the loop if you want to

01:42:00tie them around your ankle.

01:42:02When you are in a plane,

01:42:04you may notice a small triangle

01:42:06above your seat.

01:42:08These triangles indicate to the on-board staff

01:42:10the best places to check the flights

01:42:12of the plane through the canopy.

01:42:14We are never too safe.

01:42:16If your shoes are really too slippery,

01:42:18you can rub them on your soles.

01:42:20They will hang better

01:42:22and you can wear them when it rains.

01:42:24But be careful not to sand them too much.

01:42:26Your feet could get wet.

01:42:30If you drill a few holes

01:42:32at the bottom of your trash can,

01:42:34it will be easier for you to place

01:42:36and take out your bags.

01:42:38The air will circulate better

01:42:40and will not hold them back anymore.

01:42:42You will usually find silica gel

01:42:44in your bags, shoes

01:42:46and other things you buy.

01:42:48This gel absorbs excess humidity.

01:42:50Do not throw away your bags

01:42:52every time your shoes are wet.

01:42:56Thermoses were not invented

01:42:58to keep your coffee hot.

01:43:00They were designed by a Scottish scientist

01:43:02who wanted to keep his chemicals

01:43:04at a stable temperature.

01:43:06He took two bottles,

01:43:08put the smallest inside the biggest

01:43:10and removed the air between the two.

01:43:12But it's still convenient for picnics.

01:43:16You've just spent all morning

01:43:18shopping in the street

01:43:20and you finally stop

01:43:22to offer yourself a cup of coffee.

01:43:24You enter the nearest cafe,

01:43:26you place your order

01:43:28and you realize that

01:43:30you really need to go to the toilet.

01:43:32These are normal public toilets

01:43:34with several cabins.

01:43:36When you choose yours,

01:43:38the one in the middle,

01:43:40you enter inside

01:43:42and your mind begins to wonder

01:43:44why the hell

01:43:46do they have so much space

01:43:48between the door and the floor?

01:43:50Can we have a drum roll

01:43:52for this moment, please?

01:43:54Well, my friend,

01:43:56there is not only one specific reason

01:43:58why the doors of public bathrooms

01:44:00have so much space,

01:44:02but rather several.

01:44:04Public toilets are designed

01:44:06for people to spend

01:44:08as little time as possible.

01:44:10You are not supposed to feel

01:44:12the lack of space.

01:44:14In some bathrooms,

01:44:16the spaces are so large

01:44:18that users can even feel embarrassed

01:44:20to make their needs,

01:44:22for fear that other people

01:44:24who line up see them.

01:44:26Then there is the question of price.

01:44:28The manufacture of personalized doors

01:44:30can be a heavy burden

01:44:32for people who build public toilets.

01:44:34This implies knowing the exact measurements

01:44:36so that the doors always correspond

01:44:38to the format of the cabins

01:44:40All public toilet spaces

01:44:42do not necessarily have the same size.

01:44:44They can vary,

01:44:46even if this variation is weak

01:44:48and often imperceptible.

01:44:50These gaps actually help

01:44:52to reduce error margins

01:44:54and make production more profitable

01:44:56for the people who finance them.

01:44:58If a door is wider

01:45:00or narrower than it should be,

01:45:02this space regularizes the differences

01:45:04and allows them to be installed anyway.

01:45:06There is also the case of air circulation.

01:45:08The first thing you want to do

01:45:10in a public toilet room

01:45:12is to imprison the odors,

01:45:14isn't it?

01:45:16So you need a little space

01:45:18under and between the doors

01:45:20to allow air to circulate.

01:45:22Finally, these spaces

01:45:24are a good security measure.

01:45:26They always allow people

01:45:28outside to see

01:45:30if someone inside the cabin

01:45:32does not feel very well

01:45:34and may need help.

01:45:36So,

01:45:38if someone forgets

01:45:40and leaves the tap open for too long,

01:45:42or if the sink is clogged

01:45:44and the water cannot flow

01:45:46through the main evacuation hole,

01:45:48the overflow hole comes to the rescue.

01:45:50Let's say it allows you to save a little time

01:45:52before the floor of the bathroom

01:45:54is flooded.

01:45:56Have you ever noticed

01:45:58how the closing process

01:46:00of a car door can be pleasant?

01:46:02Automobile manufacturers

01:46:04use sound engineers

01:46:06to make sure that there is

01:46:08the exact amount of foam,

01:46:10carpet and tin

01:46:12in the composition of a car

01:46:14in order to produce

01:46:16the most comforting sound possible.

01:46:18And what to say

01:46:20about these little dots

01:46:22on the top of the window?

01:46:24Well,

01:46:26it's not that simple.

01:46:28It's not that easy.

01:46:30It's not that easy.

01:46:32And what to say

01:46:34about these little dots

01:46:36on the top of the front window?

01:46:38The pattern of these little black dots

01:46:40minimizes the distractions for your eyes.

01:46:42This black part,

01:46:44also called the fritz,

01:46:46is normally warmer

01:46:48than the lighter parts,

01:46:50which prevents the windshield

01:46:52from deforming.

01:46:54And no,

01:46:56the tongue located

01:46:58under your rearview mirror

01:47:00does not move

01:47:02according to the time of day.

01:47:04Push it in one direction

01:47:06and it's the daily driving mode.

01:47:08In the other direction,

01:47:10you are ready to drive

01:47:12safely at night

01:47:14because it reduces the dazzling

01:47:16caused by the headlights

01:47:18of the cars following you.

01:47:20The next time you go

01:47:22to the supermarket,

01:47:24keep this in mind.

01:47:26If you don't have a key

01:47:28try to use it to unlock the cart.

01:47:30It should fit perfectly

01:47:32and avoid having to carry coins.

01:47:34Because, to be honest,

01:47:36who has any nowadays?

01:47:38Let's move on to the elevators.

01:47:40If you want to use them

01:47:42by going directly where you want,

01:47:44try this trick.

01:47:46Most elevators have a secret combination

01:47:48of buttons that you can use

01:47:50to skip all the other selected floors

01:47:52and go directly to the one of your choice.

01:47:54It can work on all the days

01:47:56when you want to press the 33.

01:47:58In most elevators,

01:48:00it works if you simultaneously

01:48:02press the button to close the door

01:48:04and your floor number.

01:48:06This should allow you to reach your floor

01:48:08without stopping.

01:48:10Some elevators ask you to press

01:48:12twice on the selected floor numbers

01:48:14because a double pressure

01:48:16often cancels the previous request.

01:48:18Other elevators ask you to hold

01:48:20the button to open the door

01:48:22and press twice on the floor numbers

01:48:24to avoid any problem.

01:48:26It is preferable not to cancel the floors

01:48:28of other people in the elevator.

01:48:30They won't take it well.

01:48:32Keep in mind that some elevators

01:48:34may not have this function.

01:48:36For honey lovers, raise your hand!

01:48:38If your honey pot is golden and crystallized,

01:48:40remember that it is a good sign.

01:48:42Crystallized honey means

01:48:44that it has not been pasteurized,

01:48:46which means a better quality of the product.

01:48:48With a drop in temperature,

01:48:50the natural ingredient of honey,

01:48:52also known as glucose,

01:48:54will crystallize it.

01:48:56Now, try to get the best out of it.

01:48:58To add texture to your oatmeal

01:49:00or toast, add a layer of crystallized honey

01:49:02and enjoy the sweetness of nature.

01:49:04And if you don't like crystallized honey,

01:49:06put it in the microwave for a minute or two.

01:49:08Ah, winter and autumn,

01:49:10you know what that means,

01:49:12don't you?

01:49:14The season of the hives.

01:49:16But there is nothing more annoying

01:49:18than wearing your beautiful wool hive

01:49:20By the way, I don't want to make a fuss,

01:49:22but don't you want to talk about the hell

01:49:24of scratching hives?

01:49:26To prevent this from happening again,

01:49:28here is the secret.

01:49:30Put your hive upside down

01:49:32and soak it in cold water.

01:49:34Add 2 to 3 tablespoons of vinegar

01:49:36and let it soak for a while.

01:49:38Then empty the water.

01:49:40Now, while the hive is still wet,

01:49:42apply a generous amount of aftershave

01:49:44on the fibers of the wool.

01:49:46After letting it soak in the aftershave

01:49:48Gently squeeze the excess water

01:49:50from the wool and let it dry flat

01:49:52on a towel.

01:49:54And that's it, no more scratching hives.

01:49:56In all the fast foods you go to,

01:49:58you will find small paper hives

01:50:00that you can fill with ketchup,

01:50:02mustard or barbecue sauce.

01:50:04But if you eat chicken nuggets

01:50:06or if you try to dip your hamburger

01:50:08in the hive, there is always a little sauce

01:50:10that seems impossible to reach.

01:50:12Next time,

01:50:14try to unfold the hive.

01:50:16You will turn it into a small paper plate

01:50:18and this way you will have all the ketchup

01:50:20you poured at the beginning.

01:50:22Hives used in outdoor environments

01:50:24must be cleaned and lubricated

01:50:26every 3 months.

01:50:28Regular lubrication will help

01:50:30prevent hives from freezing in the cold.

01:50:32Look for the tiny hole

01:50:34on the bottom of the hive.

01:50:36Pour oil into it

01:50:38and there you go, it opens again.

01:50:40One thing we often forget

01:50:42is the tip on the cap of a cream.

01:50:44These pointed surfaces

01:50:46were designed to help us pierce

01:50:48the aluminum foil protection of the cream tube.

01:50:50Just turn the cap

01:50:52and pierce the tip with your own cap

01:50:54and voila!

01:50:56After a long day of work,

01:50:58all you really need

01:51:00is a foam bath.

01:51:02You open the hot water and let it flow for a few minutes.

01:51:04You can even light a candle

01:51:06and pour some essential oils into the water.

01:51:08Then you add the liquid soap.

01:51:10You stir the water

01:51:12until all the surface of the bathtub

01:51:14is filled with bubbles

01:51:16and you enter the bath.

01:51:18The bubbles of a foam bath

01:51:20have a fundamental primary function.

01:51:22Their role is to preserve the temperature of the water

01:51:24just so that you can enjoy

01:51:26hot water for a longer time.

01:51:28Do you have sweaty feet?

01:51:30Strange question, I know.

01:51:32But if you are one of these people,

01:51:34here is some good news.

01:51:36Everything is not lost.

01:51:38Try to put a tea bag in your shoes

01:51:40The tea bags will absorb

01:51:42the humidity and smell of the soles of your shoes.

01:51:44I'm thinking,

01:51:46shouldn't we have learned

01:51:48these things at school?

01:51:50Anyway, if you learned something new today,

01:51:52don't hesitate to tell us about it

01:51:54in the comments below.

01:51:56Imagine that you are

01:51:58an art detective

01:52:00and that your mission is to explore

01:52:02the mysteries behind the most

01:52:04famous paintings in the world.

01:52:06We are talking about works by Leonardo da Vinci,

01:52:08Michelangelo or Picasso.

01:52:10Don't forget your magnifying glass

01:52:12because your adventure is about to begin.

01:52:14The first city on your list

01:52:16is Rome.

01:52:18After tasting delicious pastas,

01:52:20you head to the Sistine Chapel

01:52:22which houses the most famous ceiling in the world.

01:52:24Have you ever heard that

01:52:26Michelangelo painted frescoes

01:52:28while lying down?

01:52:30It's just a myth.

01:52:32In fact, the painter created a complex platform system

01:52:34that allows him to paint standing up.

01:52:36You are admiring

01:52:38the creation of Adam,

01:52:40who is the fresco of the milieu.

01:52:42The Italian artist was known

01:52:44for his precise knowledge of human anatomy.

01:52:46Art experts claim

01:52:48that the right part of the painting

01:52:50is an anatomically correct representation

01:52:52of an enlarged brain.

01:52:54To verify it,

01:52:56you try to superimpose an image of the organ

01:52:58and the work of art.

01:53:00It seems to match.

01:53:02The cerebellum, the optic nerve

01:53:04and all that.

01:53:06Even the floating thing in the form of a green scarf

01:53:08seems to correspond to the vertebral artery.

01:53:10Some researchers think

01:53:12that this is how Michelangelo

01:53:14depicted knowledge and wisdom,

01:53:16but you need a night's sleep

01:53:18to get a definitive idea.

01:53:20The next day, you catch a train

01:53:22and arrive in Florence.

01:53:24It's time to taste an Italian ice cream

01:53:26and then you go straight to the Galleria Accademia.

01:53:28One of the most famous sculptures in the world

01:53:30is waiting for you inside.

01:53:32The David of Michelangelo.

01:53:34This David is a marvel of marble

01:53:365 meters high.

01:53:38It has been sculpted for about 3 years.

01:53:40The mystery surrounding it

01:53:42is to discover the true expression

01:53:44of the statue.

01:53:46By looking at it from below,

01:53:48you can tell that its face is serene and peaceful.

01:53:50But art historians claim

01:53:52that this work has been largely misunderstood.

01:53:54Apparently,

01:53:56its body hides a very different story.

01:53:58Look closer

01:54:00and you will notice that its eyebrows are frowned

01:54:02and that the veins of its arms are sagging.

01:54:04It doesn't look so relaxed after all, does it?

01:54:06Michelangelo's idea

01:54:08was to depict David

01:54:10just before a major confrontation.

01:54:12So maybe he wasn't

01:54:14as serene as that.

01:54:16Italy is so rich in works of art

01:54:18that you can't leave right away.

01:54:20You are still in Florence

01:54:22and you are now visiting the famous

01:54:24Gallery of Offices.

01:54:26Many famous paintings are housed in this museum.

01:54:28But the one you are particularly interested in

01:54:30is Botticelli's Spring.

01:54:32This work of art

01:54:34has been shrouded in mystery

01:54:36from the start.

01:54:38Experts can't say the exact year

01:54:40it was commissioned.

01:54:42It remained without a title for years

01:54:44until the painter Giorgio Vasari

01:54:46finally found a name for it.

01:54:48Usually, when critics

01:54:50and the public admire this painting,

01:54:52they focus on the characters in the foreground.

01:54:54But in this case,

01:54:56the real work lies

01:54:58in the fact that Botticelli

01:55:00painted more than 46 different plant species

01:55:02with almost photographic precision.

01:55:04And in the whole painting,

01:55:06these plant figures

01:55:08are repeated more than 200 times.

01:55:10Incredible!

01:55:12These days of visit were well filled, weren't they?

01:55:14Are you ready to continue?

01:55:16You jump in a plane

01:55:18and you arrive in Paris,

01:55:20the city of lights, love and the famous joconde.

01:55:22You cross the Louvre Museum

01:55:24and you come face to face

01:55:26with Leonardo da Vinci's masterpiece.

01:55:28There are many theories

01:55:30about this work of art

01:55:32and you dive into some of them.

01:55:34Solid arguments have been advanced

01:55:36to say that the joconde

01:55:38could be a self-portrait of the painter himself.

01:55:40Historians have carefully compared

01:55:42his face to that of Mona Lisa

01:55:44and they are surprisingly similar.

01:55:46And then there is the theory

01:55:48of the corner smile.

01:55:50Dentist and art expert Joseph Bartofsky

01:55:52claims to have discovered the secret

01:55:54of Mona Lisa's rictus.

01:55:56He says that her tight facial expression

01:55:58is the typical indication of a person

01:56:00who has lost her front teeth.

01:56:02In 2010,

01:56:04the Italian Committee for Cultural Heritage

01:56:06also discovered a collection

01:56:08of hidden symbols in the painting.

01:56:10These are only visible

01:56:12with high-tech magnifying glasses,

01:56:14but they revealed that Leonardo da Vinci

01:56:16had inscribed an LV

01:56:18inside Mona Lisa's right eye.

01:56:20Experts believe

01:56:22that this is the painter's signature,

01:56:24but the other symbols,

01:56:26a CE in the left eye

01:56:28and a 72 in the arch of the bridge

01:56:30in the background,

01:56:32are still unidentified.

01:56:34Well, that's a lot of discoveries at once.

01:56:36Of course, at the end of your visit,

01:56:38don't forget to test

01:56:40if his eyes really follow you.

01:56:42Now you're going to Amsterdam

01:56:44to visit the Rijksmuseum.

01:56:46You came to see a specific painting

01:56:48that hides a mysterious story.

01:56:50La Ronde de Nuit

01:56:52is one of the most famous paintings

01:56:54of the Flemish painter,

01:56:56but experts say

01:56:58that the name of the painting

01:57:00doesn't correspond to its content.

01:57:02Let's take a closer look.

01:57:04The painting depicts a large group

01:57:06ready to embark on a mission.

01:57:08Rembrandt's technique is called

01:57:10chiaroscuro, and highlights

01:57:12the contrast between shadow and light.

01:57:14Until 1947, art critics thought

01:57:16the painting depicted a night scene.

01:57:18But when the painting was removed

01:57:20from a thick layer of dust,

01:57:22it became clear that the scene

01:57:24took place in the middle of the day,

01:57:26with the sun falling from the upper left corner.

01:57:28It's now too late

01:57:30to change its name to Ronde de Jour.

01:57:32During your stay in Amsterdam,

01:57:34you also visit a museum

01:57:36dedicated to the art of Vincent van Gogh.

01:57:38Did you know that he painted

01:57:40more than 900 paintings

01:57:42during a period of only 10 years?

01:57:44The Van Gogh Museum houses

01:57:46the largest collection of ground-paintings

01:57:48you'll probably see in your life.

01:57:50In fact, almost all of Van Gogh's paintings

01:57:52feature dominant yellow tones.

01:57:54This particularity of his art

01:57:56is perhaps the result

01:57:58of his way of seeing the world.

01:58:00Some art experts have hypothesized

01:58:02that one of Van Gogh's medicines

01:58:04modified his perception of colours,

01:58:06making him see more yellow around him.

01:58:08Well, our journey continues.

01:58:10The next stop on your list

01:58:12is the United Kingdom,

01:58:14heading to the National Gallery.

01:58:16You could spend hours admiring

01:58:18the painting Les Époux Arnolfini

01:58:20by Jan van Eyck,

01:58:22and not see anything out of the ordinary.

01:58:24In the foreground, a couple hold hands

01:58:26and stare at the spectator.

01:58:28But if you zoom in on the mirror

01:58:30hanging on the wall,

01:58:32you'll see two other people in the room.

01:58:34Art experts say that the male character

01:58:36in the painting has his hands up

01:58:38to greet the two people in the mirror

01:58:40and that one of the characters

01:58:42is Van Eyck himself.

01:58:44And it's not the only filigree

01:58:46the painter left behind.

01:58:48Above the mirror, you'll see

01:58:50his flamboyant signature,

01:58:52Jan van Eyck et Attissi, 1434.

01:58:54Speaking of painters

01:58:56who leave traces of their own presence,

01:58:58Caravaggio, the famous Italian painter

01:59:00of the Renaissance,

01:59:02left a little Easter egg

01:59:04in one of his famous paintings, Bacchus.

01:59:06This one is a bit difficult to spot.

01:59:08In the half-full carafe,

01:59:10in the lower left corner of the painting,

01:59:12there's a tiny self-portrait

01:59:14of the painter himself

01:59:16hidden in the liquid.

01:59:18To see the image clearly,

01:59:20you need a sophisticated technology

01:59:22or at least a very efficient magnifying glass.

01:59:24But it's right there,

01:59:26a male character, alias Caravaggio,

01:59:28with a brush in his hand.

01:59:30Fun fact, the tiny self-portrait

01:59:32was first noticed in 1922,

01:59:34more than 300 years after

01:59:36the painting was finished.

01:59:38But it was ignored

01:59:40due to its poor preservation.

01:59:42To conclude your trip,

01:59:44you fly across the Atlantic to Chicago.

01:59:46The huge collection of the Art Institute

01:59:48houses a well-known painting

01:59:50by Pablo Picasso,

01:59:52the old guitarist.

01:59:54The secret of this painting is so well hidden

01:59:56that you also need the help of X-ray machines

01:59:58and super-sophisticated technology.

02:00:00But the results are worth it.

02:00:02The findings show

02:00:04that Picasso painted the old guitarist

02:00:06on top of another unfinished painting.

02:00:08You can clearly see the contours

02:00:10and shapes of a half-drawn

02:00:12female figure

02:00:14that Picasso abandoned

02:00:16in the middle of his work.

02:00:18The emerging artists of the time

02:00:20often used this way of saving money

02:00:22because the paintings were expensive.

02:00:24And that's it for this world tour

02:00:26of works of art.

02:00:28Tiring, isn't it?

02:00:30So take a break, Sherlock Holmes.

02:00:34Hacks are holes

02:00:36to prevent them from cracking

02:00:38and breaking during cooking.

02:00:40Without these holes, steam would accumulate

02:00:42in the dough until it burst.

02:00:44If you look at the capsule of a soda bottle,

02:00:46you will notice that there is a plastic disc inside.

02:00:48It is used to seal the liquid and the gases

02:00:50so that the drink remains sparkling.

02:00:52The long neck of the bottle

02:00:54is designed to encourage you

02:00:56to hold it there.

02:00:58In this way, the heat of your hand

02:01:00will only heat this part of the bottle

02:01:02and keep your whole bottle warm.

02:01:04It is difficult to see the dishes

02:01:06when they are in the oven, microwave,

02:01:08because of this black satin gray

02:01:10on the glass.

02:01:12But if it is there,

02:01:14it is to prevent the harmful waves

02:01:16from escaping.

02:01:18Acting like a shield of Faraday,

02:01:20it is used to protect you

02:01:22while ensuring adequate cooking

02:01:24of the food.

02:01:26Some products, such as chips packets,

02:01:28contain up to 43% nitrogen.

02:01:30Oxygen,

02:01:32the gas that we breathe

02:01:34in contact with the chips,

02:01:36would induce a reaction

02:01:38that would quickly oxidize them.

02:01:40This phenomenon, called oxidation,

02:01:42bears its name.

02:01:44Nitrogen, on the other hand,

02:01:46is an inert gas that keeps food

02:01:48and prevents it from being damaged

02:01:50during transport.

02:01:52Chips wrapped in an air cushion

02:01:54remain crispy and do not risk

02:01:56turning into crumbs.

02:01:58Chips are wrapped in paper

02:02:00in a uniform way.

02:02:02Before the addition of holes,

02:02:04the inside was generally greasy

02:02:06and doughy,

02:02:08and the edges were crispy.

02:02:10Marks on paper sheets

02:02:12are not used to write

02:02:14dates or lists of numbers.

02:02:16They were originally added

02:02:18to fulfill a protection function.

02:02:20At the time, rats were a real problem

02:02:22in houses,

02:02:24and paper was one of their favorite means.

02:02:26It was mostly the white paper

02:02:28that framed the part

02:02:30intended for writing.

02:02:32This hole in the stem of the chip

02:02:34is not there to prevent

02:02:36suffocation in case of ingestion.

02:02:38It serves to keep the candy in place.

02:02:40The water-filled confectionery

02:02:42enters the hollow of the stick

02:02:44and, once solidified,

02:02:46holds the chip in place.

02:02:48In this process,

02:02:50it would be more fragile

02:02:52and would come off easily.

02:02:54It is useful for dusting

02:02:56and its shape is perfectly

02:02:58suitable for cleaning frames,

02:03:00curtains, or closets.

02:03:02What is the difference

02:03:04between a wooden belt

02:03:06and a plastic belt?

02:03:08Not only does a cedar wooden belt

02:03:10match the shape of clothes,

02:03:12but it also repels mites

02:03:14and other insects.

02:03:16Salt is not only useful in the kitchen.

02:03:18It can get rid of strong odors.

02:03:20Rubbing salt on your fingers

02:03:22also works for shoes.

02:03:24The painted grids have

02:03:26a secret drawer in the bottom

02:03:28that can be removed to clean

02:03:30all these annoying little crumbs.

02:03:32If you can't get

02:03:34a chocolate out of the box,

02:03:36look at these little holes

02:03:38right next to it.

02:03:40They are there to help you.

02:03:42If you press one of these holes,

02:03:44the chocolate will easily

02:03:46come out of its notch.

02:03:48When you drink a sip of coffee

02:03:50the little hole on the lid

02:03:52allows the air to circulate

02:03:54and the drink can flow

02:03:56smoothly through the main opening.

02:03:58And that's not all.

02:04:00The little pressures

02:04:02on the top of these lids

02:04:04inform the staff

02:04:06as well as the customers

02:04:08about the contents of the cups

02:04:10to differentiate them.

02:04:12There is a legend

02:04:14about each little crumb.

02:04:16Just look at which one is

02:04:18from which they were grown.

02:04:20If there are 4 numbers,

02:04:22the first one is a 4 or a 3.

02:04:24The fruit was treated with pesticides.

02:04:26If there are 5 numbers,

02:04:28the first one is an egg.

02:04:30It is from organic farming.

02:04:32If there are 5 numbers,

02:04:34the first one is an 8.

02:04:36It has undergone genetic modifications.

02:04:38When you are on your way

02:04:40to your car after finishing

02:04:42and packing all your groceries,

02:04:44remember to use the hooks

02:04:46such as bread, eggs

02:04:48or fruits and vegetables

02:04:50that are not crushed

02:04:52by heavier products.

02:04:54If you don't have anyone

02:04:56with you to help you

02:04:58hold your tape measure,

02:05:00just nail it.

02:05:02Place your nail

02:05:04at the level of the dedicated

02:05:06little hole

02:05:08where the tape measures

02:05:10are usually placed

02:05:12and you just have to unroll it.

02:05:14The hooks used outside

02:05:16wear out quickly because of the rain.

02:05:18You see this little hole down there?

02:05:20It is used to pour engine oil.

02:05:22This trick allows you to lubricate

02:05:24the mechanism and the key

02:05:26should turn again effortlessly.

02:05:28You've been tapping on the bottom

02:05:30of the ketchup bottle for two hours

02:05:32but nothing comes out.

02:05:34Here's a little trick.

02:05:36Put the bottle diagonally

02:05:38and tap in the middle of the neck.

02:05:40In many fast food restaurants,

02:05:42they use mustard.

02:05:44Ready for the scoop?

02:05:46These little ramekins are actually

02:05:48supposed to unfold to become

02:05:50real little paper plates

02:05:52that can hold a lot more sauce.

02:05:54The little hole on the handle

02:05:56of the pans or pans

02:05:58is not only used to hang them

02:06:00on the wall.

02:06:02While you cook,

02:06:04place the end of the handle

02:06:06of the utensil you use

02:06:08in this hole.

02:06:10If you notice that

02:06:12these pans are considerably pale,

02:06:14change toothbrushes

02:06:16or just your head

02:06:18depending on the case.

02:06:20The upper hole of the sink

02:06:22has many functions.

02:06:24First of all, it prevents water

02:06:26from overflowing if someone

02:06:28forgets to close the tap.

02:06:30It also allows the water

02:06:32to evaporate faster,

02:06:34allowing the air to escape

02:06:36while the water flows.

02:06:38The lid of the sink

02:06:40can save you from awkward moments

02:06:42like an open bracket.

02:06:44Don't let the strap go up.

02:06:46If you lower the strap,

02:06:48the closure locks automatically.

02:06:50All thanks to these little notches

02:06:52placed under the tongue.

02:06:54Perimetal milk produces gases

02:06:56like most perimetal foods.

02:06:58Some plastic milk cans

02:07:00have a concave part

02:07:02on one of the sides.

02:07:04If the milk spins and produces gases,

02:07:06it will reduce if you put the can

02:07:08in the freezer,

02:07:10solidifying the milk,

02:07:12taking up more space

02:07:14than in liquid form.

02:07:16The foam bath is not just

02:07:18for fun and feeling good.

02:07:20It also regulates the temperature.

02:07:22The bubbles keep the water warm

02:07:24and you can enjoy your bath

02:07:26longer.

02:07:28However, it only works

02:07:30for acrylic baths,

02:07:32those made of metal

02:07:34and used for dishwashers.

02:07:36They allow the water to flow

02:07:38and thus avoid getting everywhere

02:07:40while rinsing the dishwasher.

02:07:42These grooves allow air to flow

02:07:44so that the cup does not crack

02:07:46even if the tea is boiling.

02:07:48The small tips in the cream tube caps

02:07:50are also useful.

02:07:52Most of the tubes are sealed

02:07:54with aluminum,

02:07:56impossible to pierce

02:07:58without saying goodbye to your nails.

02:08:00These tips open all the cream tubes,

02:08:02but they are not used to clean

02:08:04and polish your shoes.

02:08:06Applying wax on a moving escalator

02:08:08can be complex.

02:08:10These brushes are there for safety

02:08:12while preventing users

02:08:14from approaching the edge of the steps.

02:08:16They reduce the risk

02:08:18that the bottom of a long coat

02:08:20or pants will be stuck

02:08:22between the steps.

02:08:24All tic-tac boxes are designed

02:08:26to make only one tic-tac come out at a time.

02:08:28The lid has the same shape as the candy.

02:08:30If you shake the box

02:08:32until it falls right into your mouth,

02:08:34you don't know how to eat tic-tac.

02:08:36Originally, the pompom on the caps

02:08:38was not just a fashion accessory.

02:08:40It prevented sailors

02:08:42from hitting their heads

02:08:44on the ceiling,

02:08:46typically very low, of ships.

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