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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.