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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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If you could remove all of your skin, it would weigh up to 5 pounds.