JUST WHEN WE WERE beginning to think we understood the mysterious radio flashes known as fast radio bursts (FRBs), new observations make clear how much we still have to learn. The FRB 20190520B is one of a kind, Chen-Hui Niu (Chinese Academy of Sciences) and colleagues announce June 8th in Nature. It flared again and again in observations recorded by China's Five-hundred-meter Aperture Spherical Radio Telescope, putting the source among the few percent of FRBs that repeat. However, unlike most repeaters, this one never turned off. A low, persistent buzz of radio waves emanates from the same source.
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