Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Your heart beats over 36 million times a year.
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There are 20 feet of blood vessels in each square inch of human skin.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.