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Oct3-10, 11:35 AM
P: 921
It's not impossible to test, just the primary ideas in superstring theory are very difficult. For instance, supersymmetry is a direct prediction of superstring theory and is testable at the LHC. Also the permeation of a graviton into a higher dimension is possible but is extremely unlikely because gravitons don't interact strongly. Yes the vibrational states of fundamental strings are what give the particles their charge, mass, spin - all of their properties.