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One night some time ago I was in a movie theater in Los Angeles when an earthquake struck. It was a rather long one, with several aftershocks. I remember distinctly that people in the theater seemed to fall naturally into one of three groups: Some panicked and moved chaotically, unsure what to do or where to go. Some remained calm and moved to the emergency exits, just as the preshow announcement had suggested they should. And some hardly moved at all. Instead they implored others to calm down and go back to watching the movie.