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Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?
S3, EP14 "The Einstein Approximation"
Sheldon tries to figure out the answer to a physics problem by working with Penny.
S3, EP15 "The Large Hadron Collision"
Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.
S3, EP16 "The Excelsior Acquisition"
Sheldon ends up in traffic court after getting a ticket because of Penny.
S3, EP17 "The Precious Fragmentation"
When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.
S7, EP9 "The Thanksgiving Decoupling"
When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.
S7, EP8 "The Itchy Brain Simulation"
When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.
S7, EP7 "The Proton Displacement"
When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.
S7, EP6 "The Romance Resonance"
Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.
