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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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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.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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