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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Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, forcing him to choose between the two women; and Howard keeps pestering Sheldon with a magic trick.
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Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya warming up to one another.
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