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Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.