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EDINBURGH, SCOTLAND - AUGUST 12:  Nate Silver, American statistician, political forecaster and author of 'The Signal And The Noise', appears at a photocall prior to an event at the 30th Edinburgh International Book Festival, on August 13, 2013 in Edinburgh, Scotland. The Edinburgh International Book Festival is the worlds largest annual literary event, and takes place in the city which became a UNESCO City of Literature in 2004.  (Photo by Jeremy Sutton-Hibbert/Getty Images) Jeremy Sutton-Hibbert
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