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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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There are 20 feet of blood vessels in each square inch of human skin.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.