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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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.