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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?
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, 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, EP10 "The Discovery Dissipation"
Amy and Leonard try to help Sheldon deal with his shame; Raj stays with Bernadette and Howard for a week.
S7, EP11 "The Cooper Extraction"
While Sheldon is in Texas, the rest of the gang realize how much he has changed their lives as they decorate the apartment Christmas tree.
S12, EP3 "The Procreation Calculation"
Life gets complicated when Stuart starts bringing his new girlfriend home; Penny and Leonard talk about starting a family; Koothrappali explores an arranged marriage.
S12, EP2 "The Wedding Gift Wormhole"
Sheldon and Amy go crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding; Koothrappali decides to settle down and asks his father to arrange a marriage for him.
S12, EP1 "The Conjugal Configuration"
Sheldon and Amy's honeymoon runs aground in New York; Penny and Leonard discover they are uncomfortably similar to Amy's parents; Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.
