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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.