I Science.

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Micro-picture of Stained Chestnut Sprout (Aesculus Hippocastanum) plant fibers By Eckhard Volcker

Here are some interesting facts about the human body:
  1. It takes 17 muscles to smile and 43 to frown.
  2. The largest cell in the human body is the female egg and the smallest is the male sperm.
  3. The hands and feet contain almost half of the total bones in the human body.
  4. During your lifetime, you will produce enough saliva to fill two swimming pools.
  5. The only part of your body that has no blood supply is the cornea in the eye. It gets its oxygen directly from air.

Here's some other stuff: