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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.