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Perpetuum mobile

Perpetual motion is motion that continues indefinitely without any external source of energy. This is impossible in practice because of friction and other sources of energy loss. A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics. [Perpetual motion. Wikipedia]
Perpetuum mobile
Perpetuum mobile, perpetuum mobile,