Depression may be exacting a staggering toll, but its cousin—chronic anxiety—is becoming disturbingly common too, with average levels of anxiety in children and young people now at a point that would have been judged to be “clinical” in the 1950s. It’s not a great stretch of the imagination to assume that in a few decades unhappiness, depression and anxiety will have become the normal human condition, rather than happiness and contentment. Prof Mark Williams