The average office desk has 400 times more bacteria on it than a toilet.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The human body produces and destroys 15 million blood cells every second.
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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.