A long and thoughtful book with the takeaway that giving women control over their reproductive choices will solve more world problems than pretty much anything else. Yes, that simple.
Other things I learned:
* War, terrorism and chimpanzee attacks are all basically the same thing and are called "team aggression against an outgroup"
* Believing your own BS is an evolved trait in males, the benefit being that it makes you a more convincing leader, and thus increased success in your team aggression against outgroups
* We probably have more to fear from a nuclear armed Pakistan than a nuclear armed Iran.
* Unfettered access to birth control reduces birth rates (straight from the department of obvious facts)