As Wikipedia says, correctly in my view, "String theory remains to be confirmed. No version of string theory has yet made an experimentally verified prediction that differs from those made by other theories. In this sense, string theory is still in a "larval stage": it is not a proper physical theory. It possesses many features of mathematical interest and may yet become important in our understanding of the universe, but it requires further developments before it is accepted or discarded. Since string theory may not be tested in the foreseeable future, some scientists have asked if it even deserves to be called a scientific theory..."

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