Disney-Pixar’s Inside Out opens this week. The film’s fanciful premise invites moviegoers to “meet the little voices in your head”—specifically, our emotions, personified as Joy, Sadness, Anger, Disgust, and Fear. RTB editor Maureen Moser and I sat down to talk about emotions, their importance, and the role they play in our minds and hearts. (This article might contain spoilers.)