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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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There are 20 feet of blood vessels in each square inch of human skin.

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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

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