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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.