This undated publicity image released by CBS shows, from left, Simon Helberg, 

This undated publicity image released by CBS shows, from left, Simon Helberg, Jim Parsons, and Johnny Galecki in a scene from "The Big Bang Theory," a long-running series, one of 18 shows renewed by CBS on Wednesday, March 27, 2013. (AP Photo/CBS, Michael Yarish)
Associated Press
This undated publicity image released by CBS shows, from left, Simon Helberg, Jim Parsons, and Johnny Galecki in a scene from "The Big Bang Theory," a long-running series, one of 18 shows renewed by CBS on Wednesday, March 27, 2013. (AP Photo/CBS, Michael Yarish)
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