A problem blog. I has it.
It's mostly focused on physics, but there is some maths, computer science, and other stuff too. Most of the problems are quite difficult, and very few of them have been solved. Many of them I don't even know how to solve myself, and I'd be very interested in finding out. I think the good folks of this forum should be capable of handling most of them.
http://goodproblems.blogspot.com/
Let me know what you think, if there is anything you'd like to see more or less of, etc. And if you manage to solve anything.
