"Brain Rules" by John Medina [http://amzn.to/UCgCPG]
John, a molecular biologist, looks at things such as health and cognitive development and performance of kids and adults from an evolutionary perspective.
He highlights problems with our approaches to work and study, how these are at odds with the way our brains evolved to work and what we can do about it.
Great collection of actionable advice backed up by current research. See more at http://brainrules.net/
"The world until yesterday" by Jared Diamond http://amzn.to/1AAJjNL
Great book on how "traditional" societies handle trade, war and interpersonal conflicts. Lots of thing to consider taking on board in "modern" societies - such as restorative justice.
"The Antidote: Happiness for People Who Can't Stand Positive Thinking" by Oliver Burkeman http://amzn.to/1rITiKX
Great overview of pitfalls that "positive thinking" approach brings and how one can start employing alternative ways of attaining happiness.