T - The Big Bang Theory - Season 3 Episode 15 - The Large Hadron Collision

Summary: After being invited to Switzerland to see the CERN Supercollider, Leonard wants Penny to join him and make it a romantic Valentine's Day getaway. Sheldon becomes shocked that he can't go when he has a far bigger interest in the science, and tries to change Leonard's mind in all sorts of ways. Meanwhile, Leonard fears that no matter which of them he'll pick, the other will be angry and he will lose a friendship... or a relationship.

Aired: 8 Feb 2010

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