Perpertuum Mobile: The Quest for Perpetual Motion...
There has never been a machine that can keep going indefinitely, or that produces more energy than it consumes. That never stopped people from trying to invent one. Dark Roasted Blend has a collection of dozens of design...
https://www.neatorama.com/2011/09/06/perpertuum-mobile-the-quest-for-perpetual-motion/
