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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.