In his later years, Einstein sought a unified theory that would extend general relativity and provide an alternative to quantum theory. There is now talk of a ‘theory of everything’ (although Einstein himself never used the phrase). Fifty years after his death, how close are we to such a theory?
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A theory of everything?. Nature 433, 257–259 (2005). https://doi.org/10.1038/433257a
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DOI: https://doi.org/10.1038/433257a
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