. . . . . . . . . . . . "Sheldon thanking Penny."@en . "Leonard is going to Switzerland to observe the Large Hadron Collider and is planning to take Penny for a romantic Valentine's Day experience, but Sheldon has other ideas about who should be going with him."@en . . . . . . . "Season 2"@en . . . . . "2010-02-08"^^ . . . . . . . . . . . . . . . . . . . . . . "The Large Hadron Collision"@en . . . . . . . . . . . . "15"^^ . . . "The Large Hadron Collision"@en . . . "Leonard is going to Switzerland to observe the Large Hadron Collider and is planning to take Penny for a romantic Valentine's Day experience, but Sheldon has other ideas about who should be going with him."@en . "Season 4"@en . . . . . . . . . . . . . "3"^^ . . . . . . .