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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, EP18 "The Gates Excitation"
Penny gets the opportunity to host Bill Gates at work when his company wants to partner with hers; Leonard, Koothrappali and Wolowitz do everything in their power to meet him; Sheldon thinks he is the victim of a prank.
S11, EP19 "The Tenant Disassociation"
Leonard decides to run against Sheldon for president of the tenants' association; Bernadette encourages Wolowitz and Koothrappali to find the owner of a drone after they find it in the backyard.
S11, EP20 "The Reclusive Potential"
A brilliant but reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere; Penny and Bernadette improvise after Amy doesn't like the tame bachelorette party they planned for her.
S12, EP14 "The Meteorite Manifestation"
Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law; Leonard is disappointed when his friends exclude him from a scientific project.
S12, EP13 "The Confirmation Polarization"
Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination; Bernadette has a big success at work.
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.