Quote:
Originally Posted by nyrath
You can't have a perpetual motion machine because the second law of thermodynamics forbids it.
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The second law of thermodynamics is a probabilistic law though. It doesn't mean that perpetual motion machines are impossible by design, but only that a chance of any such machine being kept in motion by random movements of particles until the end of the Universe is so small it shouldn't be taken into account, ever. It's not impossible though.