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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.