"String Theory" is not even a theory in the strictest sense, since a "Theory" was previously an hypothesis that has been validated empirically.
An hypothesis is an idea that is testable.
An idea is a speculative concept that was conceived in order to explain gaps or apparent discrepancies in our current understanding.
Right now, "String Theory" has not even progressed beyond the conceptual stage - it is not testable (like an hypothesis), thus it has never been tested (like a real theory).
: : So the more correct name for "String Theory" is actually "String Concept".
QED
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