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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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).
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.