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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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