Good points all. Of all things, you've managed to remind me of "The Structure of Scientific Revolutions." (http://en.wikipedia.org/wiki/The_Structure_of_Scienti

Good points all. Of all things, you've managed to remind me of "The Structure of Scientific Revolutions." (http://en.wikipedia.org/wiki/The_Structure_of_Scientific_Revolutions http://en.wikipedia.org/wiki/The_Structure_of_Scientific_Rev...) which gave rise to that hugely overused "paradigm shift" phrase.