When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.
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Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated for its own good.
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With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed for by Penny, who hasn't a clue what she's in for.
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With Sheldon rattled and impossible to be around after meeting Dennis, a 15-year-old physicist who's smarter than he, the rest of the guys search for a way to eliminate the threat.
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Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together. Penny and Leonard learn new tactics on how to deal with Sheldon and they come from an unlikely source.
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Sheldon goes head-to-head with Wil Wheaton for the role of the new Professor Proton. Penny steps in and takes care of Halley when Bernadette and Howard both wind up on bed rest.
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Sheldon and Bert collaborate on a research project, despite Sheldon's embarrassment. Penny and Bernadette coach Koothrappali on how to navigate his relationship with Ruchi.
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Leonard and Howard are furious after they learn Sheldon went to work with the military behind their backs. Bernadette is on bed rest, and she asks Raj to do some digging when she suspects Ruchi is trying to steal her job.
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Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable Bitcoin investment. Also, a seven-year-old video reveals a secret about Leonard and Penny's relationship.
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Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Raj "breaks up" with Howard after realizing his best friend is actually hurting his confidence.
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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.
