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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The average office desk has 400 times more bacteria on it than a toilet.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.