1. When you are frightened, your hair automatically stands on end. This is an ancient biological reaction designed to frighten away attackers by making you look taller.
  2. The hair of an adult can stretch 25% without breaking. If a human hair were the thickness of nylon rope, it could support a train engine.
  3. Our eyes are always the same size from birth, but our nose and ears never stop growing.
  4. Fingernails grow nearly four times faster than toenails, but thumbnails grow the slowest.
  5. About two-thirds of a person’s body weight is water.
  6. Humans shed and re-grow outer skin cells about every 27 days - that’s almost 1000 new skins in a lifetime!
  7. The life cycle of a taste bud is about 10 days, but the cells are constantly growing back, roughly one every 10 hours.

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