If you, as a human, are thinking of a number, I can narrow it down a great deal from a uniform improper prior. I don't really like that wiki entry, though - if you ask me to guess a number and I say "I don't know," it's sure as heck not because either of us believes or is attempting to imply that I have literally no information about the problem.
I think the way in which that wiki entry is important is that "I don't know" cannot be your only possible answer to a question. If there was a gun to my head, I could give guessing your number a pretty good try. But as triplets of words go, "I don't know" serves a noble and practical purpose.
It hits a nerve with me. I do computer tech stuff, and one of the hardest things for people to learn, seemingly, is to admit they don't actually know something (and that they should therefore consider, oh, doing research, or experiment, or perhaps seek someone with experience). The concept of "Well - you certainly can narrrow it down in some way" is lovely - but you still don't actually know. The incorrect statement would be "I know nothing (about your number)" - but nobody actually says that.
I kinda flip it - we know nothing for sure ...
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.