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The speed of growth is roughly 10 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.

Hair serves a number of different functions. It provides insulation from cold weather and, in some species, from particularly hot weather. Because hair is often pigmented, it provides coloration. This might serve to camouflage an individual; in some mammals, the pigmentation changes with the seasons, becoming white during the snowy winter, for example.

Among humans, nature selected for little body hair as part of a set of adaptations including bipedal locomotion and an upright posture. Bipedal locomotion is extremely inefficient, and many animals can outrun human beings for short periods of time; such animals, however, are inefficient radiators of heat, and cannot run for long periods of time. Thus, human hunters must be able to chase animals for long periods of time, and must therefore have an efficient mechanism for radiating body heat. Upright posture, which exposes less surface area of the body to direct solar radiation, and subcutaneous sweat glands, which operate best with an absence of hair.

  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • LazrSmooth Studios
    Services include hair removal, human growth hormone replacement therapy, facial contouring therapy, chemical peels, and European shaving technique and accessories.
  • Hair Growth Rate
    Why is the hair on your arms short, but the hair on your head long?
  • Vaniqa
    Features, eflornithine hydrochloride, a prescription cream that slows the growth of woman's unwanted facial hair.
  • Hairz Online
    Offering human hair and synthetic hair wigs, weaves, braids and hair growth products.