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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.