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Sheldon makes a terrifying mathematical discovery while tutoring Billy. Also, Mary is jealous of Missy's relationship with Mandy and Meemaw.
Sheldon must choose sides in an ethical dilemma. Also, Mary tries her hand at writing and Mandy needs a new place to live.
At college, Sheldon decides to expand his responsibilities and become a dorm resident advisor. Also, Meemaw and Dale make a sketchy business deal and Mary and George Sr. rekindle their romance.