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The collective dilemma of unifying different scientific domains with often incommensurate languages, methods, and fundamental assumptions. How does the subjective, first-person world of psychology really connect to the objective, third-person world of neuroscience? How does biology's teleological language of "purpose" and "function" reduce to physics' purposeless particles? The hard problem is the seeming impossibility of a complete, coherent "theory of everything" that genuinely bridges levels of reality, not just mathematically, but meaningfully.
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