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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, EP10 "The Gorilla Experiment"
Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.
S11, EP16 "The Neonatal Nomenclature"
When Bernadette won't go into labor, her friends try different tactics to get things started; Wolowitz confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.
S3, EP7 "The Guitarist Amplification"
Sheldon tries to make peace when Leonard and Penny get into an argument.
S3, EP12 "The Psychic Vortex"
Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.