That is the question. The search for a single theory of everything is as old as science itself, and is now the beat of quantum cosmologists. But some basic tenets that inform the quest are being challenged.
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Bojowald, M. Unique, or not unique?. Nature 442, 988–989 (2006). https://doi.org/10.1038/442988a
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DOI: https://doi.org/10.1038/442988a
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