Some people teach; some think about it; everyone has something to teach. That's the point of the School of Everything. Another take on the idea, less face-to-face oriented than Project Everything but no less intriguing, is Instructables.
Some of you probably know it already. But for those who don't, take a look - it's a site where you can create videos showing people how to do something, and upload them for others to enjoy. There's all sorts there, from Lego fractals to domestic safety via science projects and cooking. It's good browsing stuff.