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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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The horizontal fraction bar was introduced by the Arabs.