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Darlene struggles to cope with the stress of construction; Lou returns as Mark's combative contrabassoon teacher.

Geoff struggles to keep his living arrangement with Erica and Barry a secret from Beverly during game night; Adam goes to his guidance teacher for a lesson in being cool so he can get closer to a new girl in chemistry class.

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Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law; Leonard is disappointed when his friends exclude him from a scientific project.

Sheldon is required to attend Sunday school, but when he returns he decides to learn all he can about a multitude of religions.

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Torres' previous transgressions haunt him as Cook takes on a tense undercover assignment.

Charlie is surprised when a woman, Gail, with whom he flirts in a bar, rejects his overtures and tells him that women around town have been comparing notes on his philandering; Jake mentions that he did an Internet search on Charlie's name and found something interesting; when Charlie logs on, he finds out that he's the subject of a very uncomplimentary new website called www.charlieharpersucks.co

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Football from the minors to the pros.

After receiving a distressing 911 call, Burgess enlists the team's help to track down a girl caught up in a sex-trafficking ring.

Haley's astrophysicist boyfriend comes to meet the family, setting Claire and Phil off in a competition about which one of them is smarter; Mitch and Cam go on a yoga retreat.

When Gloria's ex-boyfriend stops by for a visit, his striking resemblance to Manny makes Jay wonder; Phil agonizes over getting the perfect anniversary gift for Claire; Lily gets into a fight at school over bras.