In back, Hilary Barth, assistant professor of psychology, works with her student, Ariel Ballinger 07, on data resulting from a study on children's counting ability. Posted 12/20/06 So many people have had one of those moments, when a check comes after dinner and theyre having a problem adding it up, and they stop and say, Im just not any good at math! says Hilary Barth, assistant professor of psychology. But they are. We all are. Were born with it. This isnt just an opinion from an overly-optimistic academic. Barth is one of a growing number of researchers studying intuitive understanding…