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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.