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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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People about to have surgery must tell their health care providers about all supplements they take.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.