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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.