We all probably have our short list of the great dangers our world faces. Indeed, since the development and use of the atomic bomb, psychologists have talked about the “free-floating” anxiety of our time, an unnamed but nearly all-pervasive concern about the fate of ourselves and the world. So what’s on your list? Environmental degradation? Diminishing fossil fuels and other natural resources? Overwhelming poverty? The chance of devastating war? Certainly those are all on my list, too. But above all of them is my concern that we are increasingly living fractured lives, disconnected from each other and all too-often...