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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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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.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.