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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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 longest a person has survived after a heart transplant is 24 years.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.