"He used to say the left-hand side of his equation is beautiful and the right-hand side is ugly. Much of what he was doing in the latter part of his career was trying to move the right-hand side to the left... and understand matter as a geometrical structure. To build matter itself from geometry—that in a sense is what string theory does. ...especially in a theory like the heterotic string which is inherently a theory of gravity in which the particles of matter as well as the other forces of nature emerge in the same way that gravity emerges from geometry. Einstein would have been pleased with this, at least with the goal, if not the realization."
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"David Gross" interview, Superstrings: A Theory of Everything? (1992) ed. P.C.W. Davies, Julian Brown
https://en.wikiquote.org/wiki/Albert_Einstein
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Albert Einstein
1879 – 1955
deutsch-schweizerischer Physiker und Nobelpreisträger
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