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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.