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Your heart beats over 36 million times a year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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 most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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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.