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The Progress of String Theory
The physics community thinks that string theory is so much more promising than other approaches. So should we be critical of the fact that there was so much effort in string theory over the last few decades, even though it is not still connected with observations? I have mixed feelings about that. We've learned a lot about the structure of string theory itself and lessons that sort of apply to quantum gravity more broadly. All these insights came from people who were either string theorists or string theory adjacent.