In a past life as a psychologist, teacher, writer, and seminar leader, I achieved everything I believed would make me happy. I had a beautiful and fascinating wife, a wonderful family, a handsome home, and wealth beyond my wildest expectations. To the outside world, I probably seemed successful and powerful. Inside, however, was a gnawing omnipresent low-level anxiety and discontent. I had no intimate friendships and I was becoming more and more irritable and unhappy. Then, my marriage began to unravel. And, so did I.
 

How did we evolve the most loving brain on the planet?
 
Humans are the most sociable species on earth – for better and for worse.
 
On the one hand, we have the greatest capacities for empathy, communication, friendship, romance, complex social structures, and altruism. On the other, we have the greatest capacities for shaming, emotional cruelty, sadism, envy, jealousy, discrimination and other forms of dehumanization, and wholesale slaughter of our fellow humans.