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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.