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.
a not-for-profit organization with videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance which have been recorded by Salman Khan
Eric Weisstein's World of Science is written and maintained by the author as a public service for scientific knowledge and education. Although it is often difficult to find explanations for technical subjects that are both clear and accessible, this web s