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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?
S2, EP4 "The Griffin Equivalency"
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S2, EP5 "The Euclid Alternative"
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S2, EP6 "The Cooper-Nowitzki Theorem"
Sheldon and the gang are confused when a young grad student is attracted to him.
S2, EP7 "The Panty Piñata Polarization"
When Sheldon bans Penny from the apartment for a series of petty infractions, Penny vows to get revenge.
S8, EP8 "The Prom Equivalency"
Sheldon feels pressured to participate in romantic traditions when the gang re-creates a high-school prom on the roof.
S8, EP2 "The Junior Professor Solution"
When Sheldon must teach a class, Howard decides to take it; Amy takes advantage of the tension between Penny and Bernadette.