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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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Asthma cases in Americans are about 75% higher today than they were in 1980.