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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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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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There are 60,000 miles of blood vessels in every adult human.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.