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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.