Feynmantube
The Character of Physical Law (7 lectures, 1964)
1) The Law of Gravitation:
2) The Relation of Mathematics to Physics:
3) The Great Conservation Principles:
4) Symmetry in Physical Law:
5) The Distinction of Past and Future:
6) Probability and Uncertainty:
7) Seeking New Laws:
Other Lectures
Quantum Mechanics:
The Pleasure of Finding Things Out:
Dirac Memorial Lecture:
http://www.youtube.com/watch?v=TUzI7z7bUyk