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Synopsis: String theory has made no testable predictions.
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String theory may not have made testable physical predictions, but it has generated testable mathematical predictions for areas of mathematics not obviously connected to string theory, such as
enumerative algebraic geometry.
It's absurd to call string theory "bunk" at this point. I agree with many of the criticisms of string theory (I attended some talks supposedly aimed at 1st year graduate students which were unintelligible to me and to the other postdocs attending), but string theory is very far from nonsense.