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Did you know?
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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The human body produces and destroys 15 million blood cells every second.