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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The average adult has about 21 square feet of skin.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.