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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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The average adult has about 21 square feet of skin.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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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.