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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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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.