Feynman Messenger Lectures

"As part of Cornell University's Messenger Lecture Series in 1964, professor Richard Feynman delivered a series of seven lectures on physics and the process by which quantum theory was developed."

via Google Video

Lecture 1 - The Law of Gravitation
Lecture 2 - The Relation of Mathematics and Physics
Lecture 3 - The Great Conservation Principles
Lecture 4 - Symmetry in Physical Law
Lecture 5 - The Distinction Between Past and Future
Lecture 6 - Probability and Uncertainty
Lecture 7 - Seeking New Laws

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Update:

Sigh. I think there's a rule in online digital media that goes "All good things must come to an end." Unfortunately, it seems the videos have disappeared. (Should have downloaded them while I had the chance.). Oh well, perhaps some day they'll reappear.

The U.S. Constitution provides the moral justification for protecting copyright (i.e., why do we as a society even bother with protecting such things?):

"To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries."

I often wonder to what extent science and arts are being promoted these days.