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Why don't perpetual motion machines ever work? - Netta Schramm

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View full lesson: http://ed.ted.com/lessons/why-don-t-p...Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines. Lesson by Netta Schramm, animation by TED-Ed.

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