Finsrud's Perpetuum Mobile is cool, but not perpetual. The motion is very efficient but driven by magnetic fields, which costed quite some energy to create in the first place.

I once thought of putting a magnet in a coil in space. Give the magnet a swing and it would rotate forever. Free electricity! tongue

http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=98875

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