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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Illicit drug use costs the United States approximately $181 billion every year.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.