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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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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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 word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.