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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.