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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.