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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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People about to have surgery must tell their health care providers about all supplements they take.
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There are approximately 3 million unintended pregnancies in the United States each year.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.