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5:00Now PlayingIn Fun To Imagine, Richard Feynman - the Professor of Theoretical Physics at Caltech, and acclaimed Nobel-Prize winning physicist - talks to the BBC about how he derives great pleasure from thinking about how the world around us really is.
In this clip, he recalls some of the deceptively simple brainteasers that challenged him as a young freshman at MIT. Why does a mirror reverse your image horizontally, but not vertically? And what keeps a train on the track when it's taking a bend?
You can watch the entire series of Fun To Imagine here
Originally broadcast 29 July 1983.
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