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The Hard Problem of Thermodynamics focuses on explaining why thermodynamic laws—especially entropy increase—exist in the first place, rather than merely describing their effects. It questions why the universe began in a low-entropy state, why time has a preferred direction, and whether thermodynamics is emergent, fundamental, or contingent on deeper probabilistic or cosmological structures. This problem becomes even more complex in multiverse or extraphysical contexts, where different universes might follow different thermodynamic rules or none at all.
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