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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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Medication errors are three times higher among children and infants than with adults.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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