Paul J. Zak : I spent a decade trying understand why humans are usually moral . His new book reports how brain chemical oxytocin motivates moral behaviors . He also tests Aristotle 's theory that practicing virtue made one happy . Comment:
Paul J. Zak : I spent a decade trying understand why humans are usually moral . His new book reports how brain chemical oxytocin motivates moral behaviors . He also tests Aristotle 's theory that practicing virtue made one happy . The logical step was to see if I could hack the happiness molecule , he writes .