Finally, you can find out yourself. No need to take my word for it, or to peruse all those studies reporting on the average life satisfaction in countries and areas across the world.

Is it true, as I write in the book, that it does not really matter where you live? Is it true that people are actually not (contrary to what most of us would believe) happier in California than the rest of us? Is 5.8 on a 7-point scale really universal?

With the iPhone app Glow, anyone can rate their own “happiness” and have it compiled with everyone else’s to form averages in all areas across the world. Then log on via your phone, or hook up on facebook or twitter to see where the most fun is (or where people lie the most…)