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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.