Richard Feynman on Doubt and Uncertainty

From BBC Science and Nature, Horizon:

Richard Feynman was one of the most brilliant theoretical physicists and original thinkers of the 20th century. He rebuilt the theory of quantum electrodynamics, and it was for this work that he won the Nobel Prize in 1965
In 1981, he gave Horizon a candid interview, talking about many things close to his heart.

Richard Feynman | The Pleasure of Finding Things Out

Thanks, Conelrad.com!