From their days of bull sessions in Cambridge to their active duty in World War II, through marriages and divorces, professional advancement and collapse- and now well into retirement- the men have submitted to regular medical exams, taken psychological tests, returned questionnaires, and sat for interviews. During a home visit a social worker took not only a boy's history- when he stopped wetting his bed, how he learned about sex- but also extensive medical and social histories on his parents and extended family.\n But I actually don't think it's an organic thing.