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Sometimes I know that I'm going to write about a paper before I even read it. The hook is simply too inviting. A new paper, simply entitled "Time crystals," with a companion paper "Quantum time crystals," is that sort of irresistible. Even if the papers turned out to be giant piles of steaming science, lying in full repugnant view on the pages of Physical Review Letters, it was certain there would be a good story to tell.