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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.