This is a wonderful article, one I have great understanding of its' concepts, but your examples are wonderful. Look at you laminar flow and Reynold's numbers. Looking forward to having you up to Dallas November 16-17th. The rock in the river seems stagnant anchored, but it is part of the rivers complex system. Good to keep your center but not at expense of losing your understanding of the river and how important we each are to its' flow. Great stuff as always.