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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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Everyone has one nostril that is larger than the other.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.