Howard reconsiders entering into a legal partnership with Leonard and Sheldon regarding the patent for the infinite persistence gyroscope. Also, the women offer Raj dating advice after Emily reaches out to him following their breakup.
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Sheldon shocks Amy with a startling revelation after she buys him a new laptop. Meanwhile, Raj throws Leonard and Howard under the bus after they lie to their wives.
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With Sheldon hindering progress on the guidance-system project, Leonard and Stuart figure the only way they can get back on track is to engineer a distraction by getting him tickets to a historic railroad.
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Amy is incensed when she discovers Sheldon has shared intimate relationship information with people at the University; and Raj is knocked for a loop when his father stops sending financial support.
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Without financial backing from his father, Raj finds himself in a cash crunch and turns to Sheldon to help him get his head above water. Meanwhile, Penny considers crashing the guys' annual Comic-Con getaway.
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Raj moves in with Leonard and Penny and a period of adjustment begins for the three, while usually self-centered Sheldon shows surprising interest in Amy's work.
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Sheldon is working overtime and pushing himself when he collaborates on projects with Leonard and Howard, and another one with Amy, all on the same day. Bernadette's maternity leave is running out and she must face going back to work.
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About
Leonard and Sheldon are brilliant physicists, the kind of ''beautiful minds'' that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door.
