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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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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.