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The longest a person has survived after a heart transplant is 24 years.

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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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There are 20 feet of blood vessels in each square inch of human skin.

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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