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Sheldon is humiliated on National Public Radio and vows vengeance on Kripke; and Wolowitz begins a relationship with Katee Sackhoff, who appears in a cameo. Ira Flatow also makes a cameo appearance.
Leonard angers the university and the entire physics community when he gives an embarrassing radio interview. Meanwhile, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.
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