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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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There are more bacteria in your mouth than there are people in the world.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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The longest a person has survived after a heart transplant is 24 years.