Wow good stuff. Especially liked yours not linked above: http://alife.co.uk/essays/the_intelligence_explosion_is_happening_now/ I called the bluff on the exponential itself, but I was willing to believe that crossing the brain-equivalent threshold and the rise of machine intelligence could produce some kind of sudden acceleration or event. I felt The Singularity wasn't going to happen because of exponential growth itself, but might still happen because of where exponential growth takes us. But you make a very good case that the whole thing is bunk. I especially like the "different levels of intelligence" point, had not heard that before re: AI. But I find it still tempting though to say there is just something special about machines that can design other machines. That like pointing a camcorder at a TV screen it leads to some kind of instant recursion. But maybe it is similar, a neat trick but not something which changes everything all of a sudden. I wonder if someone 50 years ago said "some day computers will display high quality video and everyone will watch computers instead of TV or film". Sure it is happening, but it's a rather long slow transition which in fact might never 100% complete. Maybe AI is more like that.