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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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The average adult has about 21 square feet of skin.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.