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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Asthma cases in Americans are about 75% higher today than they were in 1980.