An excellent tutorial from the 1930's on the principles and development of the 'differential gear'- an essential part of your car.

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A fascinating demonstration of technology we use daily without even thinking about.   Now, trains don't use differntial gear, so how do they stay on a track?  It is not as simple as you thought.  Nobel Price winning physicist Richard Feynman explains: "How a Train Stays on a Track"

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