In his best-selling book Stumbling on Happiness, psychologist Dan Gilbert notes:Everyone who has observed human behavior for more than thirty continuous seconds seems to have noticed that people are strongly, perhaps even primarily, perhaps even single-mindedly, motivated to feel happy. - Gilbert (2009)Paradoxically, he observes that we are often mistaken about what will make us happy in the future. Among other things, we tend to overestimate both the magnitude and duration of our emotional reac...