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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.

The diameter of a human hair ranges from about 18 µm to 180 µm. In people of European descent, blond hair and black hair are at the thinner end of the scale, while red hair is the thickest. The hair of people of African descent is typically thicker than the hair of other groups.

Typically, humans have more hair on the top of the head (perhaps to protect against too much radiation from the head), where extremities meet the torso (axillary (arm-pit) hair and pubic hair), on the eyelids and above them (eyebrows). In most societies people shave, style or adorn their hair for aesthetic reasons.

  • Hairz Online
    Offering human hair and synthetic hair wigs, weaves, braids and hair growth products.
  • Lucia
    Manufactures hair, eyebrow and eyelashes growth products made of natural Japanese ingredients. Based in Nagoya. Site in English, Japanese, and Korean.
  • Regaine Solutions
    Explains the process of hair growth and hereditary hair loss and offers a minoxidil based hair loss treatment for both men and women.
  • Hair Growth Rate
    Why is the hair on your arms short, but the hair on your head long?
  • ThymusKing
    Offering ThymuSkin products for stimulating the growth of new hair. Includes information on hair loss and directions for use.