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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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People about to have surgery must tell their health care providers about all supplements they take.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.