Exploring 60 Concise Body Facts For Inquisitive Minds

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Transcript

00:00 - Whenever we yawn, we use the muscles in our mouth and tongue, and the contact can

00:06 squeeze some of the saliva-producing glands.

00:09 As a result, we might squirt a tiny stream of saliva without even noticing it, but it'll

00:15 reach out a foot or more.

00:17 I had a friend in college who could do that at will.

00:19 It was impressive.

00:21 - It turns out that saliva is basically filtered blood.

00:25 Blood is processed thanks to special glands, and special cells absorb its properties.

00:31 After that, the blood becomes saliva.

00:34 - Moving on, if your brain were a USB drive, it would be totally insane.

00:40 Our brain capacity is somewhere between 10 and 100 terabytes.

00:44 Some scientists claim the full spectrum can reach 2.5 petabytes.

00:49 Sounds like a dog snack, doesn't it?

00:52 Given the size of the full English version of Wikipedia was calculated back in 2010,

00:57 it was only 5.6 terabytes.

01:00 - Our body heat can boil a half a gallon of water in 30 minutes, even when we're idle.

01:06 We should try that.

01:08 - Our brain can perform up to 10 quadrillion operations per second with 10 watts of power

01:14 only.

01:15 A computer that could do the same would need about 1 gigawatt of power.

01:20 This amount could power up to 300,000 houses.

01:24 - Your memory is affected by your body position.

01:27 For example, you're much more likely to recall a situation where you waved to someone if

01:32 you stand and wave again.

01:36 - Your brain has millions of neurons.

01:38 They're all different, and the speed of connection between them is different too.

01:42 That's why you can recall some information faster than others.

01:47 - Our nerve impulses, though, are super slow compared to the speed of electricity.

01:53 Neurons can speed up to 275 mph, even slower than the world's fastest car.

01:58 Still, it's pretty fast because your brain needs to respond to stuff like pain or tickles.

02:05 - The brain itself, by the way, can't feel pain.

02:09 It has no nerve endings of its own.

02:12 - People with red-colored hair are 1% of all people.

02:16 2% are natural blondes.

02:18 So yeah, most people you see with these hair colors have dyed hair.

02:23 Black is the most common hair color in the world.

02:27 - Hair is not only strong but also elastic.

02:31 It can stretch about 30% of its length when it's wet.

02:36 - The average hair growth rate is 6 inches per year.

02:39 So if you never cut your hair until you're, say, 80 years old, your hair will have grown

02:44 up to 480 inches, about the height of a 4-story building.

02:49 Still, it's not quite possible because our hair length is programmed genetically.

02:55 - A human eye resembles a car engine.

02:58 Both of them need liquid for good lubrication.

03:01 The engine needs oil, and the eye needs tears.

03:05 To make sure the eyes work right, tears are distributed all over them.

03:09 That's why we blink more than 10,000 times a day.

03:14 The eye muscle is the fastest muscle in our bodies.

03:17 We can blink 5 times per second and even more.

03:21 We spend about 6 seconds blinking every minute.

03:24 During the day, we spend 30 minutes in complete darkness just because we close the eyes, not

03:29 even including the time when we sleep.

03:33 - The only part of the human body that doesn't get any nutrients from blood is the cornea

03:38 of the eye.

03:39 The only thing it needs to work well are tears and fluid in front of your eyes.

03:45 - Most scientists agree that tears that appear out of emotion are a unique human feature.

03:51 No other animal is capable of crying because of sadness or joy.

03:56 - The pupils narrow and expand in order to control the incoming light.

04:00 If there's a lot of light, they narrow the passage for light so as to not harm the vision.

04:06 In the dark, the pupils expand to capture as much light as possible.

04:12 - Back to our mouths.

04:13 The tongue has a lot of muscles, and some of them can strain only when you're learning

04:18 a new language.

04:20 - A human bite almost always becomes infected because of all the bacteria that live in our

04:25 mouth.

04:26 In this sense, we're quite close to hyenas.

04:30 - Your bones are designed to be used a lot daily, and some of them can absorb two or

04:35 even three times your body weight.

04:38 That's impressive, but your teeth are even stronger.

04:42 When you bite something, the teeth can exert incredible pressure, up to 200 pounds.

04:47 By the way, the enamel is considered to be a part of your skeletal system.

04:53 - Our body is about 60% water, and it can be found even in bones.

04:59 About 25% of the human bone mass is made of water.

05:04 - Hydrochloric acid in our stomach, also known as the most important defender of the immune

05:09 system, helps get rid of dangerous food toxins, viruses, and bacteria you get with the food

05:15 you eat.

05:16 Even the stomach itself can be digested by this acid, but the mucous membrane protects

05:22 it.

05:23 - Even if you brush your teeth twice a day and never forget about mouthwash, your mouth

05:28 still stays one of the dirtiest parts of the human body.

05:33 - Thousands of bacteria live inside it.

05:35 The good news is that most of these bacteria are good for the body and protect it from

05:40 bad bacteria and viruses.

05:44 - People and giraffes have similar necks.

05:47 A person has the same amount of neck vertebrae as a giraffe has.

05:51 The difference, though, is about the length.

05:54 Giraffe vertebrae are about 10 inches long.

05:58 - Our spine can withstand pressure of up to 1,000 pounds.

06:02 It would withstand an adult zebra.

06:05 But please don't try it at home – there are no zebras there after all.

06:10 When you lie down on your back and elevate the knees, the pressure on your spine is about

06:15 25 pounds.

06:17 Not a zebra for sure, but a good-sized cat.

06:20 - Our spine is also very flexible.

06:23 If we could bend it, it could possibly form two-thirds of a complete circle.

06:28 Are we like snakes, then?

06:30 - In the morning, you're taller than in the evening.

06:33 While sleeping, you're no longer affected by the force of gravity.

06:37 And your spine stretches, giving you up to half an inch in height.

06:41 Too bad you become shorter by daytime, though.

06:45 - A rollercoaster actually tosses your organs around.

06:49 So when you feel like your stomach's falling down, it's actually flipping inside your

06:53 body.

06:54 - You think your fingerprints are the only unique thing in your body?

06:57 Well, they're not!

06:59 Your tongue print and your smell are also one of a kind.

07:03 If anyone sniffs you, it's reason enough to get suspicious.

07:07 - If all of your blood vessels were stretched into a single line, boy that would hurt.

07:13 But it would go around the Earth more than twice!

07:16 An impressive feat that you wouldn't see because, well, you can't live without your

07:21 blood vessels.

07:22 - You think you rest while you're asleep, but in fact, your brain doesn't.

07:28 It's actually more active at night than during the day, processing all the info you've collected.

07:33 So have some respect!

07:37 - The human liver is the busiest organ of the body.

07:40 It has over 500 functions, and not all of them are even clear to the scientists.

07:46 - Ever wonder why you feel so sleepy after lunch?

07:49 Well, that's because of your circadian rhythms, which have 24-hour cycles, demand you have

07:55 a nap after 7 hours of being awake, and food just adds to this effect.

08:01 Simple.

08:03 - Toothache and headache are linked together thanks to the trigeminal nerve.

08:08 It goes through the jaw right to the head, so when you feel tooth pain, it usually goes

08:13 hand in hand with fat in your head.

08:16 - You lose calories doing literally anything.

08:19 A healthy 8-hour sleep, for example, makes you lose up to 800 calories.

08:24 And yes, you spend energy even while eating.

08:29 - Like all mammals, we have a diving reflex that slows down or even stops some bodily

08:34 functions to keep us from drowning.

08:37 That refers to heart rate too.

08:40 - A person can go without food for more than 20 days.

08:43 However, if you don't sleep for 10 days, your body will simply stop functioning.

08:48 - Talking about sleep, the average person forgets 90% of their dreams.

08:53 And maybe that's a good thing.

08:55 Otherwise, imagine how crazy the world would've been.

09:00 - The color of your dreams is affected by the TV you watched as a kid.

09:04 If you're of an older generation that watch black and white TV, you'll see monochrome

09:10 dreams more often than not.

09:12 If you're used to color television, your dreams will also be colorful.

09:17 - Out of every 10,000 people on Earth, one person has their organs mirrored, or reversed

09:23 from their usual and customary positions.

09:26 That is, their liver would be larger on the left side, and the right kidney would be a

09:31 bit superior to the left one.

09:33 - Speaking of kidneys, your left one is a bit more elevated than your right.

09:38 That's because the liver is larger on the right side of your body.

09:42 - People with light-colored eyes, blue or green, are better at tolerating pain than

09:47 those with dark eyes.

09:49 Scientists think it might be related to melanin that affects the color of the eyes.

09:54 - The length of your foot is similar to that of your forearm.

09:58 Don't believe me?

09:59 Go check!

10:00 I'll wait right here.

10:01 Nah.

10:02 - Our skin is the biggest and fastest-growing organ.

10:07 Strong but flexible, it's a waterproof yet breathable barrier that keeps us safe from

10:13 the external world.

10:14 Our skin regenerates itself.

10:16 It helps with regulating body temperature and reduces water loss.

10:21 This has helped us to evolve into what we are today.

10:24 Our skin developed melanin, a natural pigment that blocks harmful UV radiation.

10:31 Special sweat glands helped our ancestors regulate their temperature while walking long

10:35 distances in unpleasant conditions.

10:38 Your body has between 2 and 5 million sweat glands.

10:42 The more active you are, the more sweat they produce.

10:46 Your body has a mechanism to recognize it's time for you to cool off, so you can keep

10:51 up with the workout.

10:55 Breathing isn't only about moving the air inside and outside.

11:00 It's about the way you do it, because it can literally affect your face shape.

11:04 If you breathe through your nose, you'll get well-defined cheekbones over time.

11:09 It will also make your face wider because your tongue will exert force against your

11:14 jaw.

11:15 If you breathe through your mouth, your tongue won't have a place to rest.

11:19 It will change your facial structure as time goes by.

11:23 Your face can be more narrow and your cheekbones won't be that visible.

11:27 Also, if you're a mouth breather, you'd probably tend to tilt your head backwards

11:32 more.

11:33 This way, you increase cranial contents in the back part of your brain and directly change

11:38 your entire posture, along with the shape of your neck and face.

11:44 Humans or people born between 1981 and 1996 are more forgetful than older people.

11:52 The main cause of their forgetfulness comes from higher levels of stress.

11:56 So hey, chill.

11:58 Your left lung is smaller than the right one because it shares space with your heart.

12:04 Humans don't have such big teeth as a tiger shark, or so many of them.

12:09 But research says, even though sharks have teeth coated with really tough enamel, they're

12:14 not stronger than ours.

12:17 We have proteins that glue our teeth together to stop the entire tooth from cracking.

12:23 We don't lose them, unlike sharks.

12:25 Their teeth aren't attached to their gums on a root like ours.

12:29 So they approximately lose one tooth every week.

12:34 Ever wondered why you have toenails?

12:36 Nails are made of keratin.

12:38 It's a protein you can find in fur, claws, hooves, and hair.

12:44 Unlike claws, our nails are flat and wide.

12:47 They shield the tips of our toes and fingers from injuries.

12:51 Also, thanks to fingernails, we have a rigid backing that helps us grab and separate different

12:57 objects.

12:58 It would be hard to peel a sticker from the backing or pick up a jigsaw piece without

13:03 nails.

13:04 Apes and monkeys use their feet for similar delicate tasks as well.

13:08 Scientists think that primates evolved nails to tightly grasp branches, remove ticks, and

13:14 do other similar things.

13:18 The human body glows in the dark, which means we're faintly bioluminescent.

13:24 But that light is 1,000 times weaker than our eyes can see.

13:28 Other animals will easily spot our faint light, though.

13:33 Your eyes are pretty sensitive.

13:35 You almost never get the chance to see how sensitive your eyes are because of all the

13:39 light constantly surrounding you.

13:43 Human cells are only 43% of the total cell count in your body, and the rest are microscopic

13:50 colonists.

13:52 That means you're mostly made up of bacteria and fungi, so basically you're the mix of

13:57 the DNA of gut microbes and your own DNA.

14:02 The most abundant element in the human body is oxygen at 65%, but it also contains lithium,

14:10 cobalt, gold, and uranium.

14:12 The rarest one of all is radium.

14:17 On average, humans yawn 20 times a day, partially spontaneously.

14:22 For example, when you're tired, but sometimes when someone yawns near you.

14:27 Scientists think it could be a thing called social mirroring.

14:30 Basically when animals mimic others, they recognize some action as useful, so they decide

14:36 to do it too.

14:37 With humans, it happens when someone crosses legs, laughs, smiles at you, or yawns.

14:45 Hot coffee can taste better than cold coffee.

14:48 Your taste bud receptors are most sensitive when your food is at or a little bit above

14:53 room temperature.

14:55 Hot coffee can then seem less bitter because taste buds that detect bitterness are more

15:00 sensitive when the coffee is cold.

15:03 Your pinky is a powerful little thing.

15:05 Without it, your hand would lose a significant part of its power.

15:10 Your index and middle fingers cooperate with your thumb to grab and pinch, and your pinky,

15:15 together with your ring finger, provides grip strength.

15:20 Your bones are four times harder than concrete.

15:23 The strongest bone in your body is the femur.

15:27 It can support up to 30 times the weight of a grown-up person.

15:31 Even crazier is that our bones are made up of composite material, meaning they're both

15:35 hard and elastic at the same time.

15:41 The outer layer of your skin is thicker on your feet than on other parts of your body.

15:48 The heart has its own electrical system and can continue beating even when it's disconnected

15:53 from the body.

15:54 The average lifespan of one eyebrow hair is four months.

15:59 We spend 40% of our life with our eyes closed.

16:03 Most of that time is when we're sleeping, but don't forget to count blinking too, or

16:07 while driving.

16:09 In an adult, the blood makes up 7-8% of the total body weight.

16:13 About 55% of your blood is liquid plasma.

16:17 The rest is red and white blood cells and platelets.

16:20 They form clots and prevent bleeding.

16:24 You can't swallow and breathe at the same time.

16:27 The food you swallow and the air you breathe go down the same part of your throat at first.

16:32 Only a bit deeper, the passage splits into the esophagus and trachea.

16:39 There's a name for the growling sound your stomach makes when you're hungry.

16:42 It's called barbarygmy.

16:46 About one-third of all people can raise one eyebrow, left or right.

16:51 It's a great way to send a playful signal to someone while telling a joke.

16:55 But the ability to raise both eyebrows separately is much rarer.

17:00 If you're not among them, that's because you cannot yet control and move the corresponding

17:04 muscles.

17:05 But this skill can be developed.

17:08 Stand in front of a mirror.

17:10 Hold one eyebrow with your hand and lift the other up and down, and then do the same with

17:15 the other eyebrow.

17:17 This will help you learn moving them separately.

17:22 If you can lick your elbow easily or touch your thumb to your forearm, congratulations!

17:27 You're among the minority of people.

17:29 But some people bring flexibility to the next level.

17:32 This condition is called hypermobility.

17:36 It allows rare individuals to twist their bodies into weird positions just like a snake,

17:41 putting their head between their feet, doing a back bridge, and all sorts of splits.

17:46 In some cases, hypermobility can increase sensitivity because such people have a larger

17:51 medulla.

17:52 This brain area is responsible for processing emotions.

17:57 These fearless heroes can walk in the cold wearing only swimming trunks and feel cozy.

18:02 They can stand in the snow barefoot and even swim in a river or an ice hole.

18:06 Usually, this talent doesn't come naturally.

18:10 People temper their bodies for years until they get used to withstanding extreme cold.

18:14 Of course, they don't do it just to look cool or feel cool.

18:19 Do you feel ticklish when you tickle yourself?

18:22 Normally, you wouldn't, unless someone else tickles you.

18:25 It happens because of the cerebellum area of the brain, which monitors movements, predicts

18:29 the sensations caused by your own movements.

18:32 Then, it sends a signal to other parts of the nervous system to cancel these sensations.

18:37 But some rare individuals can actually feel ticklish on their own.

18:41 If you're not among them, touching a new texture that the brain doesn't yet recognize

18:45 or using a scalp massager can help to excite your nerves and bring relaxation.

18:52 Stand in front of a mirror.

18:54 Open your mouth and try to roll the sides of your tongue up towards each other to make

18:58 a U-shape.

18:59 About 65 to 81 percent of people are natural tongue rollers, and the majority are women.

19:06 Some believed it's a genetic capability, but recent studies showed that people can

19:10 actually develop this skill by practicing.

19:13 Kachari Mudra is a term from yoga that means curling the tip of your tongue back into the

19:18 mouth.

19:21 Can you wiggle your ears intentionally?

19:24 Congratulations!

19:25 Around 22 percent of people on the Earth are capable of wiggling one ear.

19:29 As for moving both ears at once, only 18 percent can do that.

19:34 Ear wiggling used to be a common thing for our distant ancestors.

19:39 Scientists believed they could perform a variety of movements with their ears.

19:43 The group of muscles responsible for wiggling is called the auriculars, and we mostly don't

19:48 need them today.

19:49 But, some people claim that everyone can learn to move their ears.

19:52 It only takes time and practice.

19:55 Unfortunately, we still can't acquire this classy habit of twitching an ear towards a

19:59 sound source as dogs and cats do.

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