Richard Feynman is one of the geniuses of the 20th century, not only winning the Nobel prize for Physics, but also for being able to explain complex physics theories in a manner that even dumb Physics degree students (like me) can understand. Feynman was also involved with developing the bomb at Los Alamos that later went on to destroy Hiroshima, and hearing him talk of his and everyone’s elses’ reaction at the time is somewhat chilling.
This video is only part one of six, all of which should should up in the related videos if you go direct to youTube.