Curious about the vegetation on our body
• curious about the vegetation on our body
What luck brown hair, why we are like chimpanzees more than we think, and that can be considered a throwback, and that in our vegetation - no.
And the hair on the head, and down on the body - this is what we got from primates. However, this statement is not entirely correct, because the man is a primate - the genus Homo. And the hair on our body around as much as its closest relative - the chimpanzee. Once they are dark, thick and long, and we have - light, thin and short, but also located practically across the surface of the skin, except the palms, feet and toes part. Another difference - the hair on the head of chimpanzees grow only up to a certain length, as we grow all life. And both men and women at the same rate - about 1 cm per month. That is, theoretically, 85-year-old lady could well be the owner of the ten-spit. But!
The rate of hair growth depends on age, and, oddly enough, by the time of the year. The fastest growth is noted in the age 16 to 24 years, winter and summer, and even when you sleep. In this case, the hair is constantly falls, and fall particularly heavily - 60 pieces a day, in the spring - 45 pieces, and in the winter and in the summer - 20 and 25 respectively. And yes, the number of hairs on your head too, all different. This is understandable. But what is interesting: a record average of the number belongs to brown hair - 200 000, on the second line of blondes - 150 000, on the third haired - 110 000, brunettes on the fourth - 100 000, but the red, despite the beauty of Rapunzel, usually hair deprived - they only have 90,000.
Why the hair on your head? It is clear - for beauty. And this answer is incorrect. Humanity, as it is known, was born in the heat of Africa, so anthropologists believe that the original purpose of head of hair - a banal sun protection that does not overheat our human all - the brain. For the same reason Negroid - the happy owners of thick and wavy black hair.
Long hair began to grow on the head of our ancestors in ancient times of their transition to upright posture and out of the dense tropical forests in the savanna (6-7 million years ago). The shadow is already difficult to hide, so the protective "crown of the tree" became the property of "haircut". But on the body erectus ancestor hair became thinner and shorter, to not overheat the body itself.
The same protective function is carried out (and do today) the hair close to the eye. Eyebrows prevent the sweat from entering the eye, rain and even a strong wind (or even serve as an excellent means of communication, which was especially important at a time when people did not know how to talk). Eyelashes, hair in nose and ears to protect our mucous from dust and dirt. By the way, scrupulous statisticians already count how many hairs contain our eyebrows and eyelashes. The average number of the first in both sexes - 600, the second - 400.
But what about the hated body hair in the groin and armpits? It has remained. And for a long time benefit us: hair concentration in such places helps to increase perspiration and bacterial growth, and thus to strengthen and corresponding odor. According to him, our great-grandfathers and great-grandmothers, and we found each other. Smell is important to us, and today, except that now we prefer to smell a rose or musk, but the essence remains the same. As for the "shave or not to shave": women - clearly, shave, men - is ambiguous.