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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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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.