Julie and her son Nicky stood in the school yard on the first day of kindergarten. Nicky talked to the other children but never moved more than a few feet away from Nicky. Since it was the first day, when the bell rang, the teacher invited the parents to walk their children to the classroom and Julie did; but a few minutes later when Julie tried to leave, Nicky began to cry. He hung tightly to Julie’s leg, sobbing uncontrollable. Finally, after about 15 minutes, Julie pulled her away and...