All parents whose children have reached the teenage years are familiar with the way their behaviour changes. They become more emotional, more intense, more reckless – often confusingly unlike the child you had been living with not all that long ago. Until recently, these changes tended to be put down to hormones, because it was believed that the brain had reached its full growth by puberty. Scientists now realise that isn’t true. Adolescence is a period during which very significant changes in the neural architecture of the brain are underway. This re-wiring holds implications for all areas of a teenager’s life: their friendships, their sleep patterns, their risk-taking, their relationship with parents, their romantic exploration, and their susceptibility to mental health challenges. It is not surprising that, if scientists are only beginning to get to grips with these discoveries, society has not caught up. That’s why we are keen to help bring them to the public.