In the UN’s world happiness ranking, Denmark regularly takes first place. But how do they manage to feel happy when outside the weather is awful, the day is so short you barely notice it, and work brings one endless crunch after another? For that, Danes have their own life philosophy, summed up in a few simple rules that help create an atmosphere of calm, warmth, and friendliness—hygge. What it is, the book explains, tells by Mike Vinking, founder and director of the famous Institute for the Study of Happiness in Copenhagen.