In contrast to "every man for himself" interpretations of Charles Darwin's theory of evolution by natural selection, social scientists are building the case that humans are successful as a species precisely because of our nurturing, altruistic and compassionate traits.
Whether it's sports, poker or the high-stakes world of business, there are those who always find a way to win when there's money on the table.
Scientists have identified for the first time a particular gene's link to optimism, self-esteem and "mastery," the belief that one has control over one's own life — three critical psychological resources for coping well with stress and depression.