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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.