There are on average 90000-150000 hairs on the human scalp.
95 percent of our skin is covered by hair.
The first hairs of children appear in the mother’s womb, during the 4th-5th month of pregnancy.
The hair grows faster at the age of 15-30 years. Its growth slows down after the age of 50.
In summer the hair grows faster, than in winter.
Hair life span is different. For men it equals to about 2 years, and for women – to 4-5 years.
Baldness cases are rare among women, as their hair roots are located 2mm deeper in the skin than those of men.
Year by year the hair becomes shorter and sparser. People usually lose 60-100 hairs a day.
Fair-haired people have the most hair – about 150000.
Black people have the thickest hair, which can be 3 times thicker than the light ones.
Hair absorbs the humidity because of its structure. It can also accumulate some substances, that’s why it’s often used for the crime investigations. If a person is poisoned by the arsenic for example, its traces will surely remain in the hair.
Greasy hair must be washed more frequently, than the dry and normal hair. The most appropriate temperature of the water for washing is 40–45օC. It’s recommended to use a soft (free from calcium, magnesium, iron salts), boiled water or a weak solution of borax (1 teaspoon for 1L of water).
Short hair is combed from the roots to the tips, while the long hair is combed from the tips, by gradually moving the comb up. It’s recommended to use a rare-teeth comb.
The hair can be stretched out by 1/5th of its length, and then it’ll return to the primary position. Hair is comparable with the aluminium by strength and is able to endure a 100-200 g weight.
The hair grows daily by 0,33mm on average. On annual basis it equals to 12 cm. If we don’t cut our hair, we’ll have 7,5-8 metres long plaits at the end of our life.