13 amazing facts no one teaches us in school

Here's what actually happens when you apply sunscreen

If you're skeptical about the effectiveness of sunscreen, here's what really happens.

When you apply sunscreen, you create an invisible protective layer for yourself, helping to limit the effects of ultraviolet rays.

When you apply sunscreen, you create an invisible protective layer for yourself, helping to limit the effects of ultraviolet rays.

Images were recorded with a UV camera - ultraviolet camera - a device that allows recording all changes that cannot be observed with the naked eye. It is known that the effects of ultraviolet rays are terrible. Even when we can't see anything, our skin still suffers damage when exposed to the sun.

How "clean" our hands are after washing

We are still taught that we must wash our hands after eating. However, this very correct teaching is applied mechanically by many people when washing very quickly, sometimes by dipping in water, wiping their hands and then leaving.

And this is what actually happens when you wash your hands. To check the amount of bacteria left on the skin after we wash our hands - we will use Glo Germ - a cream that simulates bacteria on the skin. This type of cream is often used by nurses to practice hygiene.

Mechanism of action of braces

Braces can be said to be a savior for those who are unfortunate enough to be born with not-so-beautiful "teeth".

However, very few people can clearly understand how this savior works.

This image will tell you about how braces work.

This image will tell you about how braces work.

How does a trumpet play music when blown?

By adjusting the 3 trumpet valves, the player can change the direction of the airflow, creating different sounds.

Looks easy to understand, right?

Looks easy to understand, right?

Food entering the throat will look like this

This is what happens when we swallow food. When swallowing, food passes through the esophagus, into the stomach and intestines. Next, intestinal peristalsis (intestinal contraction process) will carry the food further down the large intestine, and wait for the owner to go to the toilet to exit the back gate.

This swallowing process is so intense that even if we hang upside down, we can still do it.

This swallowing process is so intense that even if we hang upside down, we can still do it.

Every day there are about 100,000 flights made, and they look like this

100,000 flights a day, a terrible number.

100,000 flights a day, a terrible number.

Our Earth compared to the largest star in the universe

Our giant Earth is nothing in the universe. Compared to the Sun, we are 1.3 million times smaller. This number is 10 million billion times compared to the largest star in the universe, Canis Major.

Our Earth is nothing in this vast universe.

Our Earth is nothing in this vast universe.

How is the human face formed?

In fact, human faces do not appear naturally and then grow larger. In the first months of pregnancy, the face will develop in separate and separate parts, then "put together" like a puzzle.

In it, the mouth area is "joined" last, and this is also the reason for the formation of the philtrum - the groove between our nose and mouth.

In fact, human faces do not appear naturally and then grow larger.

In fact, human faces do not appear naturally and then grow larger.

Blooming process of dandelion

Dandelion is probably too famous, especially for those who have... plowed through the Doraemon series. This plant of the daisy family is characterized by not being pollinated after flowering. Instead, they create asexual seeds, which carry the wind around the world. The result is a seedling that is genetically identical to the parent plant.

The entire process of "birth" of dandelion is briefly described in the following picture.

The entire process of "birth" of dandelion is briefly described in the following picture.

This is how climbing plants survive and grow

Vines like beans... do not have a sturdy body like regular trees. Instead, they will try to cling to hard objects to climb higher, towards the light source, thereby helping the plant grow well.

Vines like beans... do not have a sturdy body like regular trees.

Vines like beans... do not have a sturdy body like regular trees.

No one knows how dogs drink water

If your family has a dog, you are probably no stranger to feeding him: dogs eat and drink by licking.

However, if you slow down this process, you will surely be surprised to see that the way dogs drink water is actually completely different from what we think.

Dogs have a very flexible tongue.

Dogs have a very flexible tongue.

Dogs have a very flexible tongue. When drinking water, they curl their tongue into... a spoon, scooping ladlefuls of water and putting them into their mouths.

This is why cheetahs are the fastest animals in the world

To date, no land mammal can match the African jaguar in terms of speed - up to over 100km/h.

However, just being fast is not enough. With such tremendous speed, jaguars will have to find a way to keep their balance when changing direction effectively, because their prey certainly does not run straight.

And the jaguar has done this very cleverly thanks to its very flexible tail.

No other land mammal can compete with the African cheetah.

No other land mammal can compete with the African cheetah.

The Pythagorean Theorem is proved "graphically"

In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the two sides.

In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the two sides.

Surely all of us know the Pythagorean theorem (also known as the Pythagoras theorem in English) in mathematics. This is essentially a relationship in plane geometry between the three triangle sides of a right triangle.