Episode 15 - The Large Hadron Collision (315) Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider in Switzerland on Valentine's Day.
Directed by Mark Cendrowski.
Written by Lee Aronsohn,...
Episode 14 - The Einstein Approximation (314) Sheldon's search for the answer to a physics problem keeps him up all night for several days and he becomes obsessed with finding the answer. One attempt in a mall ballpit...
Episode 13 - The Bozeman Reaction (313) When their apartment is robbed and their TV, video games, and computers are stolen, Leonard and Sheldon turn to Howard to create a state-of-the-art security system, which...
Episode 12 - The Psychic Vortex (312) Sheldon and Koothrappali attend a university mixer, with Sheldon as Raj's wingman. Sheldon only went because Raj bribed him with a Green Lantern lantern, which Sheldon brought...
Episode 11 - The Maternal Congruence (311) A visit from Leonard's mother delights Sheldon and horrifies Leonard. Leonard's mother reveals that Leonard's parents are going to divorce due to Leonard's father's affair...
Leonard can only bring one guest on a trip to see CERN’s Large Hadron Collider in Switzerland on Valentine’s Day.
Directed by Mark Cendrowski.
Written by Lee Aronsohn, Richard Rosenstock & Maria Ferrari based on a story by Chuck Lorre, Steven Molaro & Jim Reynolds.
Originally aired on February 8, 2010.
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