We’ve heard about the ways different school districts are trying to curb bullying. Now, we turn to a psychology expert to find out why some kids become bullies … what can be done to stop their behavior … and whether bullying is really such a big deal, or just the latest hot-button issue. Cynthia Hartung researches disruptive behavioral disorders at the University of Wyoming. She says before we talk about the causes and cures of bullying, we have to understand what bullying really is – what sets it apart from just kids being kids.