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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.