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S03E23 - The Lunar Excitation - May 24, 2010

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S04E01 - The Robotic Manipulation - September 23, 2010
S04E02 - The Cruciferous Vegetable Amplification - September 30, 2010

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Summary

Leonard and Sheldon are brilliant physicists. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door.