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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.