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The horizontal fraction bar was introduced by the Arabs.
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Excessive alcohol use costs the country approximately $235 billion every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.