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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.
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People about to have surgery must tell their health care providers about all supplements they take.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.