I'm in no hurry to get anywhere. I don't have any plans. I don't have a map. If you did in this business, you'd destroy yourself.
Another cause of change, one less noticeable but fundamental, is the modern growth of population closely connected with scientific and medical discoveries. It is interesting that the United Nations has set up a special Commission to study this question.
I think it's fun playing a part that lots of other people have played, in a way.