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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, EP14 "The Einstein Approximation"
Sheldon tries to figure out the answer to a physics problem by working with Penny.
S3, EP15 "The Large Hadron Collision"
Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.
S3, EP16 "The Excelsior Acquisition"
Sheldon ends up in traffic court after getting a ticket because of Penny.
S3, EP17 "The Precious Fragmentation"
When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.
S12, EP12 "The Propagation Proposition"
Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
S12, EP11 "The Paintball Scattering"
Penny and Leonard organize a paintball game, which results in mayhem when Sheldon becomes jealous of Amy; Koothrappali catches Anu with her ex-boyfriend; Stuart doesn't want to move in with Denise.
S12, EP10 "The VCR Illumination"
A VHS tape from Sheldon's past inspires him not to give up; Bernadette turns into a pageant mom when she tries to help Wolowitz with his Magic Castle audition.
S12, EP9 "The Citation Negation"
Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproved; Bernadette wants to beat Howard in a popular video game.
