It is not natural" for human beings to kill each other for men to oppress women parents to oppress children for individuals or nations to accumulate massive wealth & power to abuse nature to even despise our own bodies & feel guilty for experiencing natural desires. The roots of our current malaise lie in an "ego-explosion" that happened several thousand years BC. " Primitive" pre-civilization men & women lived longer healthier happier & more productive & fulfilled lives than we do. We need to learn from their approach to life rather than dismiss it. This is the revolutionary thesis of this well-researched highly praised volume overturning the accepted wisdom of the last few centuries."