scifi levels - looking for link of article

Can anyone help me? I remember having read an article somewhere on the internet about the different stages of science fiction / free thinkers. I've tried searching, but to no avail. I only know that there were four stages and that the last, fourth category was about science fiction thinkers who think really far into the future..how earth, humanity, technology etc will be in 10000+ years. anyone know what I'm talking about? :o

>>4
Yes, but every once in a while, fiction doesn't delve too deep into fantasy and actually has a realistic outlook on the future. 2001: A Space Odyssey comes to mind.

The mistake that scifi writers always make is that they assume that as we advance in technology, we will somehow be able to create technologies that ignore or circumvent the laws of physics. "Inertial dampers" and "subspace communicators" are two examples that spring immediately to mind. Sorry, but the laws of physics we know today will still apply a hundred years from now.