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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.