This vintage engineering tutorial, made by General Motors, clearly and engagingly explains how differential gears work. Posted on YouTube last year, it has now received close to a million views — not bad for something made in 1937. Ever wonder how cars can make turns without skidding? Engineers came up with the solution — more specifically, they invented the differential, a device that allows the wheels of a car to turn at different speeds.

[youtube]http://www.youtube.com/watch?v=K4JhruinbWc[/youtube]

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Tags: Mechanical engineering, Videos