I know that from the days of Watergate... the notion of two sources on a story has become the popular dogma about how you confirm something. And there is a lot of truth to that, but there are all kinds of ways to check to the extent that you can, a story that you get.
You speak of Lord Byron and me; there is this great difference between us. He describes what he sees I describe what I imagine. Mine is the hardest task.

