by Jason - Color theory, "Four primary colors? Yes, why not? It’s the closest thing to the actual physiology without getting complex." (some pertinent info here http://news.ycombinator.com/item?id=2166494)
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page.
The NOVA mini-series The Elegant Universe, watch all three one hour episodes here, divided into chapters, available in the QuickTime or RealPlayer plug-ins.
an online academic journal accepting publications on any subject. Philica takes a completely revolutionary approach to the publishing and reviewing of academic research. The instant, open-access Journal of Everything
provides direct links to over 7000 scholarly periodicals which allow some or all of their online content to be viewed by ANYONE with Internet access for free
by Richard Walters ("For the People" magazine) "Physicist Bruce DePalma has a 100 kilowatt generator, which he invented, sitting in his garage. It could power his whole house, but if he turns it on, the government may confiscate it. "
an open source, high performance library for simulating rigid body dynamics. It is fully featured, stable, mature and platform independent with an easy to use C/C++ API. It has advanced joint types and integrated collision detection with friction.