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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).