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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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There are 20 feet of blood vessels in each square inch of human skin.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.