For centuries the pursuit of happiness was the preserve of either the philosopher or the voluptuary and took second place to the basic need to survive on the one hand, and the pressure to conform to social conventions and morality on the other. More recently there is a burgeoning interest in the study of happiness, in the social sciences and in the media. Can we really answer the question what makes people happy? Is it really grounded in credible methods and data? Is there consistency in the determinants of happiness across countries and cultures? Are happiness levels innate to individuals or...