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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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There are 60,000 miles of blood vessels in every adult human.