But this foundational principle of science has now been called into question by String Theory , which is a relative newcomer to theoretical physics, but one that has captured the common imagination, judging by the popular explanations that abound on the Web [ Jon , Man , Woo ] . And whether string theory is or is not science, Popper notwithstanding, is an issue that is still up for debate [ BP , Cas , Fra , Sie ] .
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