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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?
S4, EP13 "The Love Car Displacement"
Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.
S4, EP14 "The Thespian Catalyst"
Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.
S4, EP15 "The Benefactor Factor"
A wealthy donor makes Leonard question what he is willing to do for science.
S4, EP16 "The Cohabitation Formulation"
Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.
S8, EP16 "The Intimacy Acceleration"
Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love; Howard and Bernadette get into trouble at the airport.
S8, EP15 "The Comic Book Store Regeneration"
While the gang waits for the reopening of Stuart's comic book store Wolowitz gets some shocking news; Penny has trouble taking her own advice; Leonard and Raj think they spot Nathan Fillion at a restaurant.
S8, EP14 "The Troll Manifestation"
Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.
S8, EP13 "The Anxiety Optimization"
Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough; Wolowitz invents a game about Raj.
