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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.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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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.