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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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.
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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.