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Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The human body produces and destroys 15 million blood cells every second.
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The average office desk has 400 times more bacteria on it than a toilet.