>The idea does not necessarily imply that there is no objective truth; rather that our access to it is mediated through our senses, experience, conditioning, prior beliefs, and other non-objective factors. The implied individual world each person occupies is said to be their reality tunnel.
http://en.wikipedia.org/wiki/Boltzmann_brain
> The paradox states that if one considers the probability of our current situation as self-aware entities embedded in an organized environment, versus the probability of stand-alone self-aware entities existing in a featureless thermodynamic "soup", then the latter should be vastly more probable than the former.
Apparently this is a well documented phenomenon (even though you pressed the button a few hundredths of a second too late, your brain is persuaded you pressed it correctly), and it blew my mind when I first read about it. Now when it happens to me I'm deeply aware of it, but it's still a little surreal (and frightening) to realize that our brains are indeed very fallible.
This is skepticism raised to the nth degree -- brain-in-a-vat-ism. I'm not even sure I read the article now.