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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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There are 20 feet of blood vessels in each square inch of human skin.