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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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.