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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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There are 20 feet of blood vessels in each square inch of human skin.
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Your heart beats over 36 million times a year.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.