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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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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.