Fresh from the philanthropic bounty of Bill Gates comes a very fine series of seven lectures (the 1964 Messenger Lectures at Cornell University) on physics by Richard P. Feynman, that rarest of rare combinations, a great researcher who is also a great communicator. Mr. Gates bought the rights to this great series of lectures from the BBC in order to make them freely available to everyone online.
The whole scheme is called Project Tuva. Why Tuva? Well, that's another story altogether.
Enjoy and Be enlightened.
Aside: A thought, a palpable thought: you'll notice Feynman's distinctive New York accent (and, it has to be said, New York manner). The key to understanding Feynman is that he was a quintessential New Yorker.