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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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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The longest a person has survived after a heart transplant is 24 years.