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Did you know?
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% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The human body produces and destroys 15 million blood cells every second.