A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
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Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university party.
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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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Howard uses a robotic arm for his own pleasure, and Sheldon goes on a date with Amy Farrah Fowler, his first date ever, and Penny finds herself accompanying them.
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Sheldon meets Amy Farrah Fowler's mother and comes to the realization he no longer wants to see Amy; and Leonard realizes everyone is in a relationship except for him.
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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.
