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When Leonard is giving a plus one to go to Switzerland to see the Large Hadron Collider on Valentine's Day, Sheldon tries to convince Leonard to take him over Penny.
Sheldon gets a job at the Cheesecake factory to help his solve a theory; Leonard and Wolowitz steal Raj's idea for a double date.
When Leonard and Sheldon's apartment gets robbed, their friends help them devise a security system.
Sheldon and Raj attend a university mixer where Raj meets Abby (Danica McKellar); Leonard is upset to find out that Penny believes in psychics.
Leonard's mother, Beverly (Christine Baranski), is back and Leonard is upset to find out she's getting divorced and told Sheldon, not him.
Penny seeks Sheldon's help to better understand Leonard's work; Wolowitz gets jealous when Leonard and Bernadette become friends.
When Kripke embarrasses Sheldon on NPR, he swears revenge; Wolowitz is scared to commit to Bernadette.
When Leonard, Raj and Wolowitz go camping, an injured Penny must rely on Sheldon for help.
When Penny's musician ex-boyfriend wants to crash on her couch, Leonard and Penny fight and Sheldon tries to stop them.
Leonard gets tutored in football by Sheldon; a kite flying mishap causes a fight between Wolowitz and Raj