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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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 documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Asthma cases in Americans are about 75% higher today than they were in 1980.