A successful gene experiment leaves Sheldon excited to procreate with Amy, and he pulls out all stops to get her on board. Meanwhile, Raj is reluctant to reveal what the new woman in his life does for a living.
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A geologist coworker's MacArthur Genius fellowship award leaves Sheldon stone cold jealous. Meanwhile, Howard stumbles upon a remote-control Stephen Hawking action figure that he invented. Hawking appears as himself.
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A great divide develops between Sheldon and Leonard when it comes time to divvy up their shared belongings. Meanwhile, with Bernadette heading into her pregnancy homestretch, Raj and Stuart battle to be the one providing her the most help.
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After a marital disagreement, Penny takes off for a spa weekend with Amy, and Sheldon steps in to play peacemaker for the squabbling newlyweds. Meanwhile, Howard and Raj do battle with a noisy floor in the baby's room.
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Sheldon learns about an MIT invention that can help read people's emotions. Leonard has trouble hiding his emotions when Penny announces her brother is going to visit; and Raj gathers former girlfriends to ask for their dating advice.
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With Sheldon hindering progress on the guidance-system project, Leonard and Howard 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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Leaving baby Halley in day care proves to be tough for Bernadette after she starts back to work; and geologist Bert digs up a girlfriend, but some of his colleagues think she's a golddigger.
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