Hello everybody, Recently, I read this interview with Edward Witten where he claims that supersymmetry is a falsifiable prediction of string theory. But then again, I remember interviews with proponents of supersymmetry where they were asked whether the inability to find any hints of SUSY in LHC experiments is a set-back for SUSY. And almost all of them replied that the LHC experiments only tell us that we have to search for SUSY at higher energy levels. Now, I wonder if there is an upper bound for the energy level to look at such that the SUSY proponents would admit the falsification of SUSY when no hints of it can be found at this energy level. Because if there is no such bound, then the SUSY proponents could always just reply that we must search at higher energy levels. So my question is: Can supersymmetry be considered a falsifiable prediction, and if yes, how can you falsify supersymmetry? Best regards, Robert Edit: Added a missing word.