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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.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The FDA recognizes 118 routes of administration.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.