"From the beginning it was clear that, despite its successes, the Standard Model of elementary particles would have to be embedded in a broader theory that would incorporate gravitation as well as the strong and electroweak interactions. There is at present only one plausible candidate for such a theory: it is the theory of strings, which started in the 1960s as a not-very-successful model of hadrons, and only later emerged as a possible theory of all forces."
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Steven Weinberg, in foreword to (pbk reprint of 1998 original)
https://en.wikiquote.org/wiki/String_theory
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String theory
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