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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The human body produces and destroys 15 million blood cells every second.
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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.