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The horizontal fraction bar was introduced by the Arabs.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.