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The human body produces and destroys 15 million blood cells every second.
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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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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.