Good evening. The millions of parents who dropped their children off at day care this morning have something important to think about tonight: a new study that makes about the impact of day care. This fairly extensive government-sponsored research indicates the more time a child spends in day care, the more likely he or she is to become aggressive, disobedient, and defiant. 17 percent of children who spent more than 30 hours a week in day care had behavior problems when they got to kindergarten. According to government numbers, nearly one out of three preschoolers go to some kind of child care facility while their parents work. CBS's Cynthia Bowers has the story behind the numbers.