I think most of the threads just kind of evolve when someone brings in a new point about something. Kind of like when a river starts to cut a new path by means of erosion. Now erosion is an interesting topic. The Grand Canyon was created by erosion from the mighty Colorado River. Or is it the snake river? Or are they the same river at different parts I dont know. I would like to visit the Grand Canyon some day. I hear its a real beautiful place.

Like that.....