I think Perna is right. No one (including Professor Jerome Kagan of Harvard, the arch-fiend) believes that more than fifty percent of mental and emotional traits are inherited. But that leaves us with the incredibly complex, difficult, mind-boggling task of figuring out how nature and nurture continually interact to produce "us". If you really want to know the answer, come back in three or four hundred years. As for us here now, we're just at the beginning of the beginning. There's just no reason whatsoever to get all riled up about nature or nurture anymore. We ALL know now that BOTH have very important roles to play in the lives of every individual. But it will be CENTURIES before we truly understand the interplay of these forces. I know that that's very unsatisfactory to a lot of people who want answers NOW. But, unfortunately, we live at the beginning of the scientific age, not at the middle or the end. And journalists (including Psychology Today) really don't care whether or not what they say is true, so long as you look at or buy the next issue of their publication. The article to which Pach pointed at the beginning of this thread is not a bad article at all. But SO MANY of them ARE! The bottom-line: for the time being and for any of our individual futures, we have to work out, by ourselves (with some slight help from our T's and P-docs) the best answers, work-arounds, solutions, ameliorations of our own problems. "Science" today holds no magic answers to the mental illnesses with which we struggle.