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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?
S9, EP15 "The Valentino Submergence"
Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.
S9, EP16 "The Positive Negative Reaction"
The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.
S10, EP11 "The Birthday Synchronicity"
While Howard and Bernadette welcome their new baby into the world, Amy celebrates her own birthday with Sheldon.
S11, EP16 "The Neonatal Nomenclature"
When Bernadette won't go into labor, her friends try different tactics to get things started; Wolowitz confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.
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.
