/sci/ - Science & Math

I propose we produce a list of sites that people can use to educate themselves. We get people asking for that sort of stuff a lot, and there are plenty of great resources that people just don't hear about. If it's substantial enough it might eventually get stickied.

http://www.khanacademy.org/
A great site for learning mathematics for anyone who is at a highschool level or below.

http://ocw.mit.edu/
Probably the best place to go for science, technology, engineering and mathematics lectures at a college level, and has lectures in plenty of other topics too.

Those are the only two I've used personally. Also, spark charts.