Something that I don't so much believe as assign a higher probability than other people.
There is a limit to how much technology humans can have, how much of the universe we can understand and how complicated of devices we can make. This isn't necessarily a universal IQ limit but more of an asymptotic limit that our evolved brains can't surpass. And this limit is lower, perhaps substantially so, than what we would need to do a lot of the cool stuff like achieve the singularity and start colonizing the universe.
I think it's even possible that some sort of asymptotic limit is common to all evolved life, this may well be a solution to the fermi paradox, not that they aren't out there, but no one is smart enough to actually leave their rock.
I have wondered about the assumption that technological / scientific / economic progress can continue forever, and I am also suspicious of the idea that arbitrary degrees of hyper-intelligence are possible. I suspect that all things have limits, and that mother nature long ago found most of those limits.
What do you believe that most people on this site don't?
I'm especially looking for things that you wouldn't even mention if someone wasn't explicitly asking for them. Stuff you're not even comfortable writing under your own name. Making a one-shot account here is very easy, go ahead and do that if you don't want to tarnish your image.
I think a big problem with a "community" dedicated to being less wrong is that it will make people more concerned about APPEARING less wrong. The biggest part of my intellectual journey so far has been the acquisition of new and startling knowledge, and that knowledge doesn't seem likely to turn up here in the conditions that currently exist.
So please, tell me the crazy things you're otherwise afraid to say. I want to know them, because they might be true.