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Physical properties of hair

Hair of a person hides in themselves a large quantity of riddles, to solve which it was not possible till today. One of them is the information which hair contain even after death of a person. Not less important feature of hair is thermoregulation. Besides hair serves as the race identifier.
The hair structure directly depends on a geographical position of the person. All climatic zones can be divided into the three parts:
- a sub polar zone with a mid-annual temperature below zero; – a midland with a mid-annual temperature above zero;
- a zone of tropics.
This rather conditional division as well as possible approaches for the consider revising.
The owners of rigid straight black hair most likely live in the first zone with a severe frigid climate, hair for them first of all was powerful protection against freezing, and after all they perfectly keep warmth.
The wide spacing of types and colors of hair is presented in a midland. But without looking at all at so wide spacing of temperatures and climatic conditions – hair of the person catch all changes.
The last and the warmest zone is equatorial. Here a thermometer column always is on a high mark and hair is the main defender of a head from solar radiation. To learn the southerner is easy: he is with thick and curly hair.
All three zones are united by one of the main properties of our hair. It is very powerful filter which protects an organism from harmful natural influences.
Igor Trigubov (heat-physicist, the winner of the state award)



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