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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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There are more bacteria in your mouth than there are people in the world.
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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Vaccines prevent between 2.5 and 4 million deaths every year.