Superb collection of discussions of perpetual motion machine principles.
I've put this under EE as it has some application in the electrical area and
may save some beginners from PMM quackery.

Excellent for "children" and engineers of ALL ages.

         http://www.lhup.edu/~dsimanek/home.htm

His top level page also useful. Some material there I'd take issue with, but
still good thought provoking stuff.

        http://www.lhup.edu/~dsimanek/

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link courtesy of Bbob.

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