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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.