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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.