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Did you know?
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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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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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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There are 20 feet of blood vessels in each square inch of human skin.