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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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The human body produces and destroys 15 million blood cells every second.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.