Happiness is ill-defined, elusive and fleeting. Yet, it is relentlessly pursued by millions of people all over the world through classes, 'happiness counselors', workshops and cruises. Entire bookstore sections are devoted to this topic and a whole branch of psychology -- positive psychology, or 'joyology' -- is dedicated to its study and propagation. Numerous studies have been conducted on happiness. In some, people choose money over well-being, others say that love and friendship are the...