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The Theory of Theories
I think what a lot of younger people would say, the lessons that have been learned from string theory is that we didn't understand quantum field theory well enough to be ready to jump. We were kind of out over our skis thinking, oh, we've got this quantum field theory thing solved. And there's so many lessons I didn't learn that were just basic lessons about how should theories be organized. So yeah, what I learned doing string theory was like, I really learned effective field theory. What I mostly learned is that this is very, very small. You can do a lot of really, really exciting and cool stuff with that or talking about it.