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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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