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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The human body produces and destroys 15 million blood cells every second.
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Vaccines prevent between 2.5 and 4 million deaths every year.