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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.