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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.