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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Illicit drug use costs the United States approximately $181 billion every year.
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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.