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I was studying about the laws of thermodynamic back at school, and I happened to have an argument regarding the second law of thermodynamic. According to the 2nd law of thermodynamic, no machine can be 100 % efficient.In reply to that, I created the 4th law of thermodynamic, which states that "Every machine is the most efficient (100% ) at doing what it does. "Do you agree with that? Is there any logical error?