What ultimately drives human behaviour? Leading professor of psychology, Michele Gelfand, suggests that culture is one of the last uncharted frontiers. From her pioneering research into cultural and social norms she’s found an important distinction between tight and loose cultures, and their tendency to make or break rules. These social norms or informal rules of conduct determine whether we co-operate or come into conflict, at both the collective and individual levels. Learn more in The power of social norms, rules to make or break.