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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.