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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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).