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When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is left in charge of the kids; Sheldon finds a book about experimenting on kids.
When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is left in charge of the kids; Sheldon finds a book about experimenting on kids.
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S3, EP12 "The Psychic Vortex"Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.
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S3, EP13 "The Bozeman Reaction"After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
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S3, EP14 "The Einstein Approximation"Sheldon tries to figure out the answer to a physics problem by working with Penny.
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S3, EP15 "The Large Hadron Collision"Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.
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S12, EP6 "The Imitation Perturbation"When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.
