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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.

When Murray goes out of town, Jane Bales attempts to make a power grab at the Ottoman Empire, forcing Beverly to retaliate; Adam is thrilled to learn that Dave Kim also plans to attend NYU.

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

Sheldon battles President Hagemeyer's mysterious boss over the university's science requirements; Mary discovers that Georgie is working at Meemaw's illegal gambling room.

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.

While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

When you're young and single in the city, your friends are your family. A tight-knit group of friends living in Manhattan -- three girls and three guys -- navigate the complexities of adulthood and rely on the companionship, comfort and support they get from each other to deal with the pressures of life.

When you're young and single in the city, your friends are your family. A tight-knit group of friends living in Manhattan -- three girls and three guys -- navigate the complexities of adulthood and rely on the companionship, comfort and support they get from each other to deal with the pressures of life.

Eve returns home for a weekend visit, and Vanessa tries to re-create a childhood tradition for the girls; Jen asks Ed and Chuck for help in finding out who is stealing her work lunches; Kristin's big day finally arrives.

A series of time jumps finds Mike and Vanessa with two new grandchildren as well as Mandy and Kyle living with them; Vanessa and Mandy clash over Vanessa's "helpfulness"; Chuck desperately hopes it's last call on Ed's mixology happy hour.

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Sheldon is shocked when a NASA representative at school dismisses his science; he becomes determined to prove him wrong.

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.

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.