The Character of Physical Law is a series of seven lectures by physicist Richard Feynman concerning the nature of the laws of physics. The lectures were delivered by Feynman in 1964 at Cornell University, as part of the Messenger Lectures series. 1. The law of gravitation, an example of physical law 2. The relation of mathematics and physics 3. The great conservation principles 4. Symmetry in physical law 5. The distinction of past and future 6. Probability and uncertainty 7. (Wikipedia)