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On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies.

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.

Structurally, hair consists of an inner cortex, comprising spindle-shaped cells, and an outer sheath, called the cuticle. Within each cortical cell are many fibrils, running parallel to the fibre axis, and between the fibrils is a softer material called the matrix. It grows from a hair follicle.

  • MoreHair.com
    Comprehensive, up-to-date information about hair growth, hair loss, and various treatment options. Factual articles on the follicle, the growth cycle, and genetics.
  • Unbalding: Hair Today, More Tomorrow?
    by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery.
  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • Norris Hair Transplant Clinic
    About the Clinic, services and procedures and contact information. Includes information on hair growth type products. Located in Knoxville.
  • Lucia
    Manufactures hair, eyebrow and eyelashes growth products made of natural Japanese ingredients. Based in Nagoya. Site in English, Japanese, and Korean.