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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.