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Is telling jokes at work good or bad for your career? Professor Brad Bitterly has been studying the question for the Wharton Business School. He gives his verdict to the ÃÛÑ¿´«Ã½'s Alex Ritson. (Image: Ricky Gervais as David Brent in The Office. Copyright: ÃÛÑ¿´«Ã½)