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There are 20 feet of blood vessels in each square inch of human skin.
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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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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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.