Why does hair turn gray with age? Detailed answer

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Why does hair turn gray with age? Detailed answer

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Why does hair turn gray with age?

The older a person is, the less the pigment that gives hair color is produced by his body. The pigment is replaced by microscopic air bubbles, causing the hair to appear gray or white.

Author: Mendeleev V.A.

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Why does blood coagulate?

We can't lose blood. Although a healthy person without a threat to life can lose up to one third of the blood, nevertheless, continuous loss of blood or loss of blood when we are sick can be very dangerous. Nature has protected us from this danger by giving the blood the ability to clot. If coagulation occurred in the circulatory system, it would be no less dangerous.

Blood does not coagulate (or clot) when it comes into contact with the smooth walls of blood vessels. Indeed, if blood is poured into a smooth-walled or lubricated glass vessel, it will not clot!

If you dip a glass rod into the blood, it won't clot either, but if you dip a wooden rod into it, the clotting will begin! Therefore, it can be considered that a rough surface or damage to the blood vessels is required to start the blood clotting process.

The first thing that happens is the appearance of very thin threads of a substance called fibrin in the blood. These threads form something like a net and entangle the blood cells, much like a cobweb entangles a fly. At this point, the flow of blood stops, and an accumulation of blood cells forms here. These fibrin strands are very strong and very elastic and can hold blood cells in a clot.

A blood clot resembles absorbent cotton, which nature has created to protect us from blood loss. Everyone's blood clots at a different rate. There are even people whose blood clots very slowly, if not at all. This condition is called hemophilia. It is a very curious disease in terms of mode of transmission.

Hemophilia only affects men, but is never transmitted directly from father to son. It is passed from father to daughter, who remains healthy but passes the disease on to his son. Thus, this illness is inherited by the grandson of the sick grandfather!

The most famous example of this disease was perhaps Queen Victoria of Great Britain. Both she and her husband inherited hemophilia from their ancestors. As a result, six of their grandchildren suffered from this disease, and among them were the Crown Prince of Spain and the son of the last Russian Tsar!

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Samsung has released the first mobile phone with a hard drive 28.09.2004

Samsung has introduced the world's first mobile phone in Japan with a built-in 1,5 GB hard drive.

Samsung has made an important new step towards further improvement of mobile phones by placing for the first time in the world a miniature one-inch hard drive with a capacity of 5400 GB in a mass-produced mobile phone model SPH-V1,5. Despite the fact that such a step was predicted by experts for a long time, a number of technical problems still did not allow starting mass production of phones with "hard drives".

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The South Korean company said that a powerful built-in microphone will enhance the functions of the camcorder, while dual speakers create a three-dimensional sound effect. It is reported that the phone has a built-in FM-receiver, two speakers and a TV-out, supports 64-tone polyphony. A number of sources say that the new phone allows you to broadcast audio to nearby FM receivers, i.e. can also work as an FM transmitter.

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