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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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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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The horizontal fraction bar was introduced by the Arabs.
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Asthma cases in Americans are about 75% higher today than they were in 1980.