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Vaccines prevent between 2.5 and 4 million deaths every year.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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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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