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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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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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.