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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.