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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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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).