It is the adults who should be afraid this Halloween. Not of ghouls and goblins, but of permanently scarring their children. In a recent study of six- and seven-year-olds in the Philadelphia area, Penn State psychologist Cindy Dell Clark found that most parents underestimate just how terrifying the holiday can be for young kids. Halloween has been scaring the heck out of kids of all ages for centuries. Two thousand years ago, Celts living in what is now the United Kingdom celebrated their new year at the end of October. During these days of transition from the end of summer...