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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?
S1, EP3 "The Fuzzy Boots Corollary"
Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.
S3, EP13 "The Bozeman Reaction"
After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
S12, EP22 "The Maternal Conclusion"
Leonard is pleasantly surprised when Beverly comes to visit, and she's genuinely kind to him, until he finds out the real reason she's there; Denise and Stuart overstay their welcome at the Wolowitz house.
S8, EP12 "The Space Probe Disintegration"
When the guys agree to do something the girls like, Sheldon and Leonard end up having a confrontation.
