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Physicist Richard Feynman explains how a train stays on the tracks. From the BBC TV series 'Fun to Imagine' (1983). You can now watch higher (more)

Physicist Richard Feynman explains how a train stays on the tracks. From the BBC TV series 'Fun to Imagine' (1983). You can now watch higher quality versions of some of these episodes at www.bbc.co.uk/archive/feynman/

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