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There are 20 feet of blood vessels in each square inch of human skin.
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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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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.