The brain has developed the same way it always has, even since ancient times. But the world that an adolescent brain develops in today is drastically different. Take screens, for instance. What's happening in the brain when teens spend hours and hours every day looking at their phones or playing video games?
For CPR's special series, "Teens Under Stress," we take a closer look at the teen brain with child and family therapist Craig Knippenberg of Denver. His book "Wired and Connected" explores brain development in K-6 children.