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Sheldon’s major scientific breakthrough makes him feel like a fraud. Meanwhile, Howard’s (romantic gesture to Bernadette causes Penny to step up her game with Leonard, on THE BIG BANG THEORY, Thursday, Oct. 24 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. Pictured left to right: Jim Parsons, Simon Helberg, Kunal Nayyar and Johnny Galecki Photo: Michael Yarish/Warner Bros. Entertainment Inc. ©2013 WBEI. All rights reserved.