Episode Synopsis: A coffee-shop explosion keeps the ER busy. Meanwhile, Adele’s Alzheimer’s worsens, prompting Richard to consider changing their living situation; Callie helps Meredith study for her boards; Lexie joins Arizona and Alex in pediatrics, where they continue to care for intern Morgan’s premature son; Mark encourages Jackson to find ways to relieve his stress after the younger doctor snaps at a patient; and Cristina lets her suspicions get the better of her.
Original Air Date: Feb 23, 2012
