Welcome to the bright new world of positive living

At one time, 'self-help' books were considered a little odd. Now they have moved into the mainstream and the new 'science of happiness' has become a cultural orthodoxy. Carole Cadwalladr asks if this vogue for positive psychology really helping anyone?

Home truths

Writer Sathnam Sanghera tells Mary O'Hara why mental illness should not be a closed book