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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.