What are human teeth? Detailed answer

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What are human teeth? Detailed answer

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What are human teeth?

In order to better understand modern phenomena, it is necessary to know their evolution. You probably never thought about the origin of your teeth, right? But this is very interesting!

Human teeth are nothing but transformed fish scales!

Fish that lived on Earth hundreds of millions of years ago were covered with protruding scales. Those of them that were located near the jaws helped to hold and dismember the prey. Even in our time, human teeth and scales, for example, sharks have almost the same structure.

The tooth has three main parts: the root located in a special recess in the jaw; a crown that protrudes above the gum, and a neck that separates the two.

Teeth don't "grow" out of our jaw like trees grow out of the ground. It would be more correct to compare them with plants in flower pots. Each tooth is fixed in its own bone "pot".

How does a tooth get the nutrients it needs? It turns out that an open “root canal” approaches it, through which nerves, arteries and veins pass. They enter the cavity of the tooth, or pulp, carrying with them all the necessary substances.

Most of the tooth is made up of a bony structure called dentin. The same part that we see is covered in enamel.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How tall is a giraffe?

Usually, looking at animals, we are not particularly surprised, but when looking at a giraffe, you involuntarily feel that there is something special in his appearance. The reason for this is probably its long, long neck. The giraffe is the tallest animal on Earth and often reaches a height of 5,5 m.

The giraffe also has very fast legs, and although they are the same length, the strongly developed muscles at the base of the neck give the impression that the spine of the giraffe is sloping from the chest to the tail. A small and narrow head with dark and soft eyes gives this huge animal an expression of tenderness. The large ears of the giraffe are sensitive to the slightest rustle and, together with the sharpest sense of smell, are very important for determining the approaching danger.

The giraffe has an unusually long tongue, sometimes reaching a length of 46 cm, but despite this, the giraffe is so skillful with it that it plucks small leaves of thorny plants without even pricking. If you watch a moving giraffe, you get the impression that he is more likely to hobble than walk. At the same time, a giraffe chased by someone can reach speeds of more than 50 km / h and overtake the fastest horse!

Being gentle in nature, if necessary, the giraffe can be very dangerous in a fight, kicking with its hind hooves and acting with its head like a sledgehammer. Even a lion tries to be very careful while hunting a giraffe.

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Translucent flexible solar cells 26.12.2013

Hendrik Bolink from the University of Valencia (Spain) and his colleagues experimented with organic compound molecules from methane and ammonia tails, as well as iodine and lead atoms. Spanish physicists have created translucent solar cells based on thin films of an organic analogue of the mineral perovskite, which are highly efficient and can bend, which allows them to be used as a tinted coating for glasses, according to an article in the journal Nature.

In recent years, scientists have created several exotic materials that can increase the efficiency of solar cells by several times. In particular, the attention of physicists is increasingly attracted by the mineral perovskite, whose thin films are semiconductors that convert light energy into electricity well.

Hendrik Bolink from the University of Valencia (Spain) and his colleagues experimented with organic compound molecules from methane and ammonia tails, as well as iodine and lead atoms. Having studied the chemical properties of this substance, the authors of the article came to the conclusion that it is similar in its properties to perovskite and can capture photons of light just as well and convert their energy into electricity.

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The main advantage of the invention of Bolink and his colleagues is that such solar cells are translucent and flexible. Coupled with their microscopic thickness, this allows such photovoltaic cells to be used as glass coatings capable of generating electricity or heat.

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