The Witness: Richard Feynman

The first half of this video is from a series of lectures given by the Nobel prize-winning physicist Richard Feynman, originally given at Cornell University in 1964. This particular clip is from his fifth lecture. The full seven-part lecture series can be found here: The second half of this video is from the BBC Horizon documentary The Pleasure of Finding Things Out. The full video can be viewed here (Dailymotion):