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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Your heart beats over 36 million times a year.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.