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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.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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.