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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The longest a person has survived after a heart transplant is 24 years.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.