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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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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 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.