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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).