I have forgotten most of my childhood and colleagues lectures. And today I am again delighted by the joy of learning and lectures thru a lecture series published by Bill Gates under Project Tuva with Microsoft Research. This is a lecture by a wonderful professor Dr. Richard Feynman about the Characteristic of Physical Law, using the Law of Gravitation as an example.
Watch it here: http://research.microsoft.com/apps/tools/tuva/#data=4%7C6b89dded-3eb8-4fa4-bbcd-7c69fe78ed0c%7C%7C