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...
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