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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Medication errors are three times higher among children and infants than with adults.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.