Why does a person have hair? Detailed answer

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Why does a person have hair? Detailed answer

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Why does a person have hair?

Humans are mammals, and all mammals have hair. On the example of other animals, we can see how useful hair is. The main benefit is that they retain body heat. Tropical animal hair protects from direct exposure to sunlight. The long mane is able to protect the neck of the animal. Porcupine hair helps him fight his enemies. But why does a person need hair?

First of all, it must be said that at birth the child is covered with a soft fluff. As the child matures, his hairline turns into the hairline of an adult. And the development of this adult hairline is regulated by certain glands containing special hormones.

In men, these hormones cause hair growth on the body and face, while inhibiting the growth of hair on the head. In women, these hormones work quite the opposite. They have less hair on the body and face, but more hair grows on the head. These differences in hair growth between men and women are called secondary sex characteristics. That is, this is one of the possible ways to distinguish between the two sexes. A beard on a man not only shows that he is a man, but, as is commonly believed, gives a man the appearance of a strong and worthy person.

The famous XNUMXth-century naturalist Charles Darwin believed that as man evolved, he needed fine hairs on his body to assist in the evaporation of sweat and rainwater. Hair found in certain parts of the body, such as eyebrows, eyelashes, and hair on the ears and nose, help protect these body openings from dust and insects.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who was the first to react to the first rocket launches by Robert Goddard, the American rocketry pioneer, and how?

At the beginning of the 1857th century, two people independently conceived a new field of application for rockets - space exploration. These were the Kaluga teacher Konstantin Eduardovich Tsiolkovsky (1935-1882) and the American Robert Goddard (1945-XNUMX).

Tsiolkovsky first published his reasoning and calculations on this issue in 1903, Goddard - only in 1919. However, Goddard was the first to put his theoretical considerations into practice. On March 16, 1926, on a snow-covered farm in Auburn, Massachusetts, he made the world's first rocket launch with a liquid-propellant rocket engine of his own design. The rocket rose to a height of 12,5 meters, the flight lasted 2,5 seconds.

The only ones whose attention was attracted by this achievement were Goddard's neighbors, who indignantly demanded that he continue his experiments somewhere else. Goddard had to comply, which did not prevent him from developing and testing a number of experimental liquid rockets and engines in subsequent years. A crater on the far side of the Moon is named after Robert Goddard.

Test your knowledge! Did you know...

▪ Which country is the smallest in the world?

▪ Who refuted the teachings of Ptolemy?

▪ Who gets the Darwin award and why?

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