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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 60,000 miles of blood vessels in every adult human.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.