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Brad agrees to coach Sue's no-cut acapella group. Brick asks for Frankie and Mike's advice when girlfriend Cindy tells him that he reads too much.

When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules.

Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

When Dr. Sturgis bonds with Paige, another 10-year-old genius, Sheldon gets jealous. Meanwhile, Mary invites Paige's family over for a play date.

Amy doesn't have time to work on a project, so Sheldon goes to great lengths to ensure she can work with him, even if it means sabotaging her career.

When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation. Leonard is shocked that Penny doesn't remember their first kiss.

Leonard is caught in a tough spot when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway.

Sheldon tries to bond with Amy's father, but Howard lures Mr. Fowler away with magic tricks. Raj and Anu try to get physical for the first time.

Sheldon and Amy are devastated learning that Super Asymmetry has been discovered and disproven. Bernadette asks Denise to help her win a videogame.

A VHS tape inspires Sheldon to not give up on his and Amy's theory. Bernadette turns into a pageant mom over Howard's Magic Castle audition.

Penny and Leonard organise a paintball game that results in mayhem. Raj catches Anu with her ex, and Stuart doesn't want to move in with Denise.

Penny's ex, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Raj attempts to mend things with his ex-fiancée.

The couples take the drama offstage for a chaotic night out in NYC. Edward gives Marissa an ultimatum. Mallorie's friend reveals a shocking secret.