Frances Jensen is a neurobiologist who has just published really interesting research on the development of teenagers brains. She found that the brains are developed but not fully insulated in the teenage years, and the last place to be insulated is the prefrontal cortex, which is responsible for decision-making. That's why teenagers are generally more impulsive and make bad decisions. They are also more susceptible to addiction and the effects of drugs and alcohol. This article and interview on NPR's Fresh Air does a better job of explaining it all. What do you think about this research? Can you see the links to child welfare?