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The longest a person has survived after a heart transplant is 24 years.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.