There are many effective psychological therapies to help teenagers with depression, anxiety or other mental health problems. Unfortunately, for various reasons, most teenagers never get access to a professional therapist. To overcome this problem, some researchers are exploring the potential of brief, “single-session” interventions that can be delivered cheaply and easily to many at-risk teenagers outside of a clinical context. In The Journal of Child Psychology and Psychiatry, Jessica Schleider and John Weisz at Harvard University present extremely promising results from their trial of a 30-minute computer session teaching depressed and anxious teenagers that personality is malleable.