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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").