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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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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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There are approximately 3 million unintended pregnancies in the United States each year.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.