9 Moments from The Big Bang Theory's "The Intimacy Acceleration"

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As a joke, Sheldon (Jim Parsons, right) and Penny (Kaley Cuoco-Sweeting, left) try an experiment designed to make participants fall in love, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved