What are nails made of? Detailed answer

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What are nails made of? Detailed answer

Big encyclopedia for children and adults

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What are nails made of?

If every time you cut your nails, you would experience pain, then most likely you would try never to do this. How many people would have long nails!

But biting, breaking, cutting nails, we do not experience pain because they are made of dead cells. Nails are special structures that grow from the skin. Most of them are made up of keratin. It is a tough, dead form of protein, a substance resembling horn. At the base and on the sides, the nail fuses tightly with the skin. Under it is the most ordinary skin, with the exception that it has special elastic fibers that are tightly attached to the nail.

He himself is quite thick, but the root part under the skin is very thin. It protrudes slightly outward in the form of a white crescent and is called the "hole". The nail grows by 50 mm per year.

Women try to decorate their nails with colored varnishes and polishing. But for many people, nails cause all sorts of problems. Damage is one of the causes of most diseases. A burn or frostbite can cause the nail to never grow again. Excessive rigidity or, conversely, fragility can be the result of an infection, a digestive system disorder, poor circulation, or glandular disorders.

Women who complain about their nails in most cases have themselves to blame. Because, trying to grow their nails as long as possible, they are more likely to expose them to various injuries.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why do people smoke?

Millions of people know that smoking is dangerous to health, and yet millions of people smoke. Why? Experts from many branches of knowledge who have dealt with this issue believe that the process by which smoking becomes a habit, as well as the reasons why people start smoking, is not so easy to explain. Of course, you can point to some of the reasons why people start smoking and the reasons why they can't quit. But the thing is, it's not all that simple. For example, it is known that most people start smoking because the people around them smoke.

Did you know that in the UK, in 1982, 38% of men and 33% of women over the age of 16 were heavy smokers? Children see that their parents smoke, it begins to seem to them that if they also start smoking, they will look "adult", and then their friends persuade them to try - and they start smoking. Smoking becomes a habit because of the effect it has on the smoker. For example, nicotine in tobacco affects the heart and nervous system.

The smoked cigarette increases the heartbeat and raises the blood pressure slightly, providing, in general, a calming and relaxing effect on the person. Having experienced this feeling once, I want to feel it again. And then it begins to seem to us that we cannot do without smoking, that is, we must smoke after a certain time interval and in certain situations. And that's how we get hooked on smoking. Since the reasons why people smoke are quite complex and vary from person to person, there is no one-size-fits-all recipe for quitting smoking.

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The Japanese corporation Toshiba announced the development of a high-definition display that displays a three-dimensional picture, which does not require special glasses to view. The new product is planned to be shown next month.

The innovative LCD panel is built on lenses with a variable refractive index (GRadient-INdex, GRIN) and low crosstalk (2% versus 5% for conventional 3D screens). The current prototype has a 15-inch diagonal and a resolution of 3840 x 2160 pixels (Ultra HD, 4K).

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