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The horizontal fraction bar was introduced by the Arabs.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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.