In an effort to understand the physical and emotional changes middle school kids experience, Ira speaks with reporter Linda Perlstein, who wrote a book called Not Much Just Chillin' about a year she spent following five middle schoolers. Then we hear from producer Alex Blumberg, who was a middle school teacher in Chicago for four years before getting into radio. Alex's takeaway? We shouldn't even try teaching kids at this age. Marion Strok, principal of a successful Chicago school, disagrees. (6 1/2 minutes)