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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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Your heart beats over 36 million times a year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.