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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, EP8 "The Adhesive Duck Deficiency"
Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.
S11, EP14 "The Separation Triangulation"
Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room for a quiet place to work.
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.
S3, EP12 "The Psychic Vortex"
Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.
