The second law of thermodynamics

There are ones that seem to keep going,but in reality, they invariably turn out to be drawing energy from some external source.Even if engineers could somehow design a machine that didn't violate the first law of thermodynamics,it still wouldn't work in the real world because of the second law.The second law of thermodynamics tells us that energy tends to spread out through processes like friction.Any real machine would have moving parts or interactions with air or liquid molecules that would generate tiny amounts of friction and heat,even in a vacuum.