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Did you know?
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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.