According to Ray Kurzweil, human intelligence (both biological and non-biological) will saturate the universe and cause it to "wake up" sometime within a few centuries. Some have also speculated that exponential technological progress could lead to the development of sub-Planckian "ontotechnology" which can bypass or even change the laws of physics. Do you think that there are fundamental limits on technological growth? Do you think that any limits that we see are just the result of our limited intelligence? I mean, after all, once upon a time, we thought it was impossible to go into space.