Math Overflow

This is a slightly embarrassing confession of benighted ignorance (until very recently), and a pointer for anyone who is still in the dark.

Quite some while ago I gave up looking at the sci.logic newsgroup: what was once a resource has become overwhelmed by the usual spam and porno links, interspersed with the occasional crank posting. Sci.math held out, it seemed, a bit longer but there's now too much crap, or questions from students wanting homework answers, to make it worth bothering with (...