This image released by CBS shows, from left, Kaley Cuoco, Mayim Bialik, Mark Hamill, Jim Parsons and Johnny Galecki in a scene from "The Big Bang Theory." The Nielsen company said Tuesday that both "NCIS," and "The Big Bang Theory" reached more than 15 million viewers last week, far above any other shows on the air last week. (Michael Yarish/CBS via AP)
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