'Brilliant, eye-opening, and absolutely inspiring - and a riveting read.' Cass Sunstein, author of How Change Happens and co-author of Nudge

What is the secret to humanity's evolutionary success? Could it be our strength, our intellect... or something much nicer?

From the authors of New York Times bestseller The Genius of Dogs comes a powerful new idea about how 'friendliness' is the key factor in the flourishing of our species. Hare and Woods present an elegant new theory ca ...