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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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People about to have surgery must tell their health care providers about all supplements they take.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.