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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.