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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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Everyone has one nostril that is larger than the other.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.