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The average office desk has 400 times more bacteria on it than a toilet.
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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.