Tim, It's becoming obvious that our discussion has either stupified people with boredom or you & I are verging onto that ground where lightheartedness causes feelings of unease - though lightheartedness is in my experience one of the great identifiers of the really effective, whether in the arts or medicine or soldiering or whatever. You can take it I'm nearly always in deadly earnest. And as you can see I'm constitutionally unable to express myself earnestly. My last couple of posts should be seen as a prolonged howl of exasperation at the armies of snake oil hucksters who have come trooping to my door over the past 50 years flogging nostrums - always supported with the latest & most rigorous research by people who know rather less about true scientific method than my cat - nostrums which are doomed to be discarded with a disillusionment as passionate as the faith with which they were originally embraced. Scottie