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?

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     Energy can't be created or destroyed - you can't create more energy than you put in within a device.
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    Machine must be operated in vacuum
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    Machine must be soundless, as sound is a way of lost energy!!
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    Something more?!!!

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