I am interested in the roots of masculine-feminine differences in nature and nurture. I want experts to tell me if I have this right or wrong. Cultural influences on where a person operates along the masculine-feminine continuum include norms, expectations, and approval/disapproval. One tends to do what he or she is encouraged and rewarded for doing. Repeated behaviors create and deepen neuropaths, creating habits. Cultural influences seem to reinforce physiological differences. Nature and nurture collaborate. The good news is we are not hard wired. We – and our brains – can change. Both men and women can learn and use both masculine and feminine strengths to be more effective.