Watch A Series Of Seven Brilliant Lectures By Richard Feynman -- io9
Richard Feynman was obviously famous for his work as a physicist, but he's also widely regarded as one of the most lucid and effective lecturers to ever address an audience. So renowned, so readily accessible were his presentations, that his introductory physics lectures (which he delivered to undergraduates at Caltech) have since been immortalized in the form of a three-volume set called, quite simply, The Feynman Lectures.
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My Comment: I always loved his books and videos. It's good to see 7 of them together.