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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Thyroid conditions may make getting pregnant impossible.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.