... theoretical physics is less clean than the way it's usually solved. You can always change parameters and save yourself. ... it's very rare that t… - Carlo Rovelli

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... theoretical physics is less clean than the way it's usually solved. You can always change parameters and save yourself. ... it's very rare that theories are ruled out by just an experiment or a group of experiments. Theories usually come with flexibility. Theoreticians can add flexibility. And so new experiments — you can just patch up your theory.