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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, EP6 "The Cornhusker Vortex"
Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.
S11, EP12 "The Matrimonial Metric"
Sheldon and Amy subject their friends to a series of secret experiments to discover which two would be most qualified to be the best man and the maid of honor at their wedding; Penny reveals her true feelings about Amy.
S2, EP23 "The Monopolar Expedition"
While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.
S3, EP7 "The Guitarist Amplification"
Sheldon tries to make peace when Leonard and Penny get into an argument.
