Secrets Insolites Que Cachent les Objets du Quotidien

Sympa

Salut tout le monde, vous avez une seconde ? Il faut absolument que vous regardiez cette vidéo : elle révèle les incroyables secrets cachés dans les choses que nous utilisons tous les jours, comme les clés USB. Sérieusement, vous ne croirez pas ce qui se cache sous la surface de ces objets quotidiens. C'est comme tout un monde de connaissances qui attend juste d'être découvert. Alors, prenez vos snacks, mettez-vous à l'aise, et plongeons ensemble dans les mystères cachés des choses que nous pensions bien connaitre. Croyez-moi, vous ne voudrez pas manquer ça !  Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com   Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna​ ---------------------------------------------------------------------------------------- Nos réseaux sociaux : Facebook: https://www.facebook.com/sympasympacom/ Instagram: https://www.instagram.com/sympa.officiel/  Stock de fichiers (photos, vidéos et autres): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ----------------------------------------------------------------------------------------  Si tu en veux encore plus, fais un tour ici:  http://sympa-sympa.com

Transcript

00:00 What is hidden inside the Coca-Cola cans and the usual household batteries?

00:05 Why do magnets affect breakfast cereals?

00:09 Do pedestrian crossing buttons really work?

00:12 Or are they just useless decorations?

00:14 What does this USB symbol really mean?

00:17 I'm not sure I know the answers to these questions and similar ones,

00:22 but I can't wait to learn the truth with you.

00:24 Let's find out together.

00:26 Coca-Cola cans have a secret that few people know.

00:30 Here is a Coca-Cola can.

00:32 Let's plunge it into a highly corrosive alkaline solution.

00:35 Aluminum dissolves due to a process known as hydrolysis.

00:40 And we can see a plastic coating inside the can.

00:43 It is made from a polymer or epoxy resin

00:46 and serves as a kind of protective barrier between the aluminum walls of the can and the rather acidic soda.

00:53 Despite a popular myth, household batteries do not actually contain liquids.

00:58 And if you cut them accidentally, no toxic liquid will spill over.

01:03 Most of them are dry batteries, made of electrochemical cells.

01:07 They transform chemical energy into electrical energy.

01:10 Larger batteries often contain many small cells in their body.

01:15 Even Tesla vehicles' batteries are made up of several small cells.

01:19 Once combined, they easily provide the necessary voltage.

01:23 Most toothbrushes have hairs of different colors.

01:29 But they are not only pleasant to the eye.

01:32 These hairs, often blue, have a specific function.

01:36 They are called toothbrush indicators,

01:39 and their color fades as you use the brush.

01:43 The American Tooth Association recommends changing your toothbrush at least four times a year.

01:48 And by becoming more pale, these hairs help you determine when it is time to replace your toothbrush.

01:54 You will probably agree that there is no better snack than a packet of chips.

01:59 Some are flat, others have holes.

02:02 Is it just a matter of aesthetics?

02:04 Not really.

02:06 The main goal of these lines on certain types of chips is to help distribute spices and seasonings.

02:12 In other words, all these substances that give your chips a cheese flavor are mainly stored inside the lines.

02:20 In addition, the lines make the chips more crispy.

02:24 Now, this may be a surprise.

02:28 But some cereals for breakfast are magnetic.

02:31 It is because they are often enriched in iron in the form of fine powder.

02:35 Because of this addition, the cereal flakes are attracted by the magnets.

02:40 All this may seem a little scary.

02:42 But in reality, the amount of iron in the flakes is minimal and does not pose any danger to your health.

02:48 This clear liquid in gel pens is called an ink follower or blocking fluid.

02:54 The gel in these pens contains pigment particles dissolved in a polymer solution.

03:00 The main task of the blocking fluid is to serve as a barrier to prevent the gel from evaporating or fleeing.

03:07 Without this transparent fluid, your gel pen would not work.

03:11 The fluid always stays in one position and does not dissolve with the gel.

03:16 It does not retreat either, nor does it flow out of the pen.

03:20 Many pedestrian crossing buttons, especially in New York, are placebo buttons.

03:26 They do literally nothing when you press them.

03:29 Originally, they were functional after being introduced in 1964.

03:34 But today, most of them do not affect traffic lights, which are programmed according to the real needs of the traffic flow.

03:43 Why do such buttons exist then?

03:46 It is a simple psychological trick that gives you an illusion of control.

03:51 You may have noticed that the seats in the cinemas are almost always red.

03:57 This choice is not a fortuitous one.

03:59 It has a strategic importance that is rooted in visual science.

04:03 Indeed, red light has a longer wavelength.

04:07 This means that it is the first color to disappear in low light.

04:11 This allows the audience to focus better on the screen once the film has started.

04:16 Such a design choice improves the viewing experience by minimizing distractions.

04:22 Do-Dans are essential for pedestrian safety.

04:27 But at the same time, they can seriously increase car emissions due to the constant acceleration and deceleration they cause.

04:35 To solve this problem, some cities, like London, test fictitious do-dans.

04:40 These are illusions of optics painted on the road.

04:43 They seem to be elevated from the driver's point of view, but in reality, they are flat.

04:48 Authorities hope that this approach will slow down drivers without having a negative impact on the environment.

04:56 Soda bottles are always filled in such a way that there is a space between the liquid and the cap.

05:02 This is because soda contains carbon dioxide.

05:05 It is a gas that can expand once a bottle is heated.

05:09 If there is no vacuum in the bottle, it can break due to the pressure that accumulates inside.

05:14 In addition, when you open your drink, the gases come out in the form of bubbles, overflowing the drink.

05:20 The empty space also helps to solve this problem.

05:25 The USB symbol, which looks like a trident, has always aroused multiple speculations about its origin.

05:31 A popular idea is that it represents Neptune's trident and symbolizes power and adaptability.

05:37 But there is also a slightly less exciting theory.

05:40 A man who claimed to have designed the symbol in the 1980s, declared that it was supposed to represent connectivity.

05:47 The large circle symbolizes a computer, while the attached shapes, the circle, the triangle and the square represent different outputs.

05:55 The design of a tennis racket has a specific feature known as the "throat".

06:03 It is an open space under the racket head.

06:06 This space is not only intended to store the balls.

06:09 It also improves the aerodynamics of the racket by letting the air pass through.

06:14 It considerably reduces drag during swings.

06:17 Speaking of tennis, tennis courts are generally built with a north-south orientation.

06:23 This helps to minimize the impact of the sun's position during the game, ensuring that no player has the sun directly in their eyes.

06:30 Look closely at the airlines of a tramway, and you will see that its contact points make zigzags rather than go in a straight line.

06:40 This is because all trams have pantographs attached to their roofs.

06:44 The upper part of the pantograph is gradually worn by the airline and must finally be replaced.

06:51 To use it uniformly, the wire is not strictly installed along the path of the tram, but in a zigzag pattern.

06:58 As the tram moves forward, the pantograph slides along the wire, and it sews uniformly.

07:07 These water fountain cones are intentionally designed to prevent users from placing them.

07:14 This allows employees to minimize the risk of spilling water on their desks around various electronic devices.

07:21 In addition, less material is used to produce cone-shaped cones, which makes the process less wasteful and more profitable.

07:29 It also promotes durability by encouraging people to drink their water quickly and get rid of their cup immediately afterwards.

07:37 Most suitcases have two zippers, and they are used for several things.

07:44 First of all, if a zipper breaks down, the other can keep the suitcase closed.

07:49 Even better, having two zippers allows you to access small sections of your suitcase more easily without having to open it completely.

07:57 And finally, when you have two zippers, you can connect them with a lock to reinforce security.

08:04 Some plastic milk containers have bumps on their sides. These bumps serve several purposes.

08:12 When the milk spills, it usually causes a swelling and high pressure accumulation inside the container.

08:18 This is when the bump unfolds and prevents the container from exploding.

08:22 In addition, if you decide to freeze the milk, it will spread like any other liquid.

08:27 And again, the indentation will unfold and prevent the container from breaking inside your freezer.

08:33 If you have ever wondered why fake bags exist, you must hear this.

08:39 The main reason is that if a garment has a cut or a specific shape, the bags can spoil it.

08:45 They can modify the shape of the item, either in the warehouse or already on the sales portal in detail.

08:50 The solution? Get rid of the bags in the key areas.

08:53 In addition, fake bags are obviously cheaper and they don't deform.

08:58 Thermos was not invented to keep your coffee hot.

09:03 It was created by a Scottish scientist who simply wanted a safe place to keep his chemical products at a stable temperature.

09:10 So he took two bottles, placed the smallest inside the largest, and sucked the air between them.

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