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Also on Flixxy: What Keeps The Train On The Track? (not as simple as you thought)     From the BBC TV series 'Fun To Imagine' (1983). 
Richard Feynman (1918–1988) was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the superfluidity of supercooled liquid helium, as well as work in particle physics.  For his contributions to the development of quantum electrodynamics, he received the Nobel Prize in Physics in 1965.  During his lifetime and after his death, Feynman became one of the most publicly known scientists in the world.

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