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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The horizontal fraction bar was introduced by the Arabs.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.