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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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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
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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.