Howard has regrets about introducing Bernadette to the others when she and Leonard really start to get along; forcing him into an uncomfortable position in which he will do anything to separate them again. Meanwhile, Penny sees the connection between Bernadette and Howard and she wants to learn what Leonard’s job really is about. However, her only choice for help is Sheldon, who isn’t the best teacher for those not so interested in science.
Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.
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