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A Delta Air Lines employee holds a sign during a rally outside an employee parking lot as a Delta jet comes in to land in Atlanta. Erik S. Lesser/AP hide caption

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Former Enron CEO Kenneth Lay stands outside the U.S. courthouse in Houston after the close of his bank fraud trial in May 2006. Two Stanford University researchers say that lying CEOs tend to use a lot of words that express positive emotion to overcompensate. Dave Einsel/Getty Images hide caption

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