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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?
S11, EP1 "The Proposal Proposal"
Amy answers Sheldon's marriage proposal; Howard and Bernadette struggle with unexpected news.
S11, EP2 "The Retraction Reaction"
Leonard's job is at stake after he gives an embarrassing radio interview; Amy and Bernadette bond over having to hide their success from Sheldon and Howard.
S11, EP3 "The Relaxation Integration"
As Sheldon stresses about picking a wedding date, Amy tries to convince him he has a more laid-back side; Koothrappali and Stuart compete to win the heart of Bernadette's new co-worker.
S10, EP22 "The Cognition Regeneration"
Leonard is less than thrilled when Penny considers accepting a job offer from Zack, her ex-boyfriend.
S11, EP13 "The Solo Oscillation"
Sheldon kicks Amy out to work solo; Amy and Leonard bond during a series of science experiments; Bert replaces Wolowitz in the band; Sheldon finds Penny a surprising source of scientific inspiration.
