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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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.