Nine Sapiens: Biology and Evolution of Personality Types by Hugo Krüger

The roots of personality along two fascinating journeys: 70,000 years ago, and one inch inside the brain. A provocative text that presents a solid hypothesis on the possible scientific bases of the Enneagram model of personality, providing evidence from recent findings in the fields of behavioral genetics, neurobiology and evolutionary psychology. Have lots of fun, learn about crazy (yet true) stuff that you had never heard before about the internal wiring of your own personality, be surprised by scientific discoveries and learn about each type's contribution to the survival of our species; all of them told to you in an easy-to-read, approachable style.