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Any proposition concerning the fundamental nature of reality, existence, and being that lies beyond or underlies the physical world accessible to science. It deals with questions of what is ultimately real: Is consciousness a product of the brain or a fundamental property of the universe? Do abstract concepts like numbers or justice have a real existence? Metaphysical hypotheses provide the foundational assumptions upon which other systems (science, religion) are built, but are themselves notoriously difficult to test empirically.
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