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Richard Powers lounges in bed all day and speaks his novels aloud to a laptop computer with voice-recognition software. Junot Diaz, author of the Pulitzer-prize winning novel "The Brief and Wondrous Life of Oscar Wao," shuts himself in the bathroom and perches on the edge of the tub with his notebook when he's tackling a knotty passage. Hilary Mantel, whose Tudor drama "Wolf Hall" claimed this year's Man Booker Prize, jumps in the shower when she gets stuck. "The...