There's also the question of how little energy is enough to perform computations, and I've enjoyed greatly a video on the subject by PBS Space Time: "Reversing

There's also the question of how little energy is enough to perform computations, and I've enjoyed greatly a video on the subject by PBS Space Time: "Reversing Entropy with Maxwell's Demon | Space Time" https://www.youtube.com/watch?v=KR23aMjIHIY https://www.youtube.com/watch?v=KR23aMjIHIY Turns out even in case of an "ideal Maxwell'S Demon", the memory operation required to handling pass/stop necessitates certain energy use.