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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, EP2 "The Big Bran Hypothesis"
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
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.
S6, EP5 "The Holographic Excitation"
The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.
S2, EP14 "The Financial Permeability"
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
