"To build matter itself from geometry — that in a sense is what string theory does. It can be thought of that way, 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. … He would have liked the fact that there is an underlying geometrical principle — which, unfortunately, we don’t really yet understand."
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David Gross, in his interview in Superstrings: A Theory of Everything? (1988) edited by P.C.W. Davies and Julian Brown
https://en.wikiquote.org/wiki/String_theory
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String theory
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