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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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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.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.