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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.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.