Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.
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After meeting at a fundraising gala, an aged but wealthy, Caltech donor makes Leonard ponder if he's willing to have sex with her to secure another donation.
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Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, forcing him to choose between the two women; and Howard keeps pestering Sheldon with a magic trick.
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There's impactful news on the work front as Penny makes a big step toward pursuing a full-time acting career, and Sheldon is forced to take a vacation.
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Howard and Leonard are putting in late nights at work and Sheldon is having trouble keeping up; Raj and a pregnant Bernadette spend a day together; and Penny and Amy take in a faculty party.
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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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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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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.
