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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Stuck on the solution to a physics problem, Sheldon seeks a number of alternative approaches to change his thinking and free the mental block; including working with Penny at The Cheesecake Factory.
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A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting for her the story of how he met and moved in with Sheldon.
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Howard and Raj try to find the perfect match for Sheldon by setting him up on an Internet dating site. Seeing her new boyfriend interact with the gang makes it clear to Penny that she can't go back to dating dumb jocks after dating Leonard.
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Sheldon and Amy decide to move in together when her apartment floods. Meanwhile, Howard and Bernadette become upset when Raj learns the gender of their baby before they do.
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In order to remain Sheldon's roomie, Amy fibs about repairs being made to her apartment. Later, they present a episode of "Fun with Flags" in Penny's apartment.
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A successful gene experiment leaves Sheldon excited to procreate with Amy, and he pulls out all stops to get her on board. Meanwhile, Raj is reluctant to reveal what the new woman in his life does for a living.
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ABOUT
Leonard and Sheldon are brilliant physicists, the kind of ''beautiful minds'' that understand how the universe works. 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.
