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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.