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After cleaning up after an internet experiment, Leonard discovers a letter in the trash can inviting the roommates to present some research they've done to a physics conference.  However, Sheldon refuses to let them do it and Leonard chooses to go on his own.  The two end up having a fight that Penny tries to solve but ends up making worse.  Sheldon goes to the conference to try and stop Leonard by "blowing up" his head a la Scanners.  When that doesn't work they get into a physical fight that Wolowitz records and puts on Youtube.

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