Personality has long been related to happiness and well-being. Studies of the “Big Five” personality traits (Extraversion, Neuroticism, Conscientiousness, Agreeableness and Openness to Experience) consistently show that extraverts are happier than introverts, as are agreeable individuals compared with those who are less agreeable. In contrast, neuroticism is associated with less happiness and fewer feelings of well-being. Yet within these big groups there is a lot of variation: not all extroverts are jubilant and not all neurotics are miserable. Moreover, there is always the lingering . . .