Site which posts huge amount of (non-hacking)problems to solve

[mlxer]

I once found a site where people in general(I think) posts all kind of interesting problems to solve, ie not just hacking problems but physics, environment, chem, economy, etc. Real world problems, not school quizzes. Anyone know what I'm talking about?

[fwdbureau]

Assuming you're not referring to yahoo Questions, there's a nice list here, maybe your site was included? Brainrack and InnoCentive seem to match your description: http://en.wikipedia.org/wiki/List_of_crowdsourcing_projects

[user24]

project euler? http://projecteuler.net/

[mlxer]

Nope, nothing like that, more like what was posted below. Euler is great for programming exercises though.