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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 average adult has about 21 square feet of skin.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.