Four probable detections of gravitational waves have so far been reported, each associated with the merger of two black holes. Analysis of the signals allows formation theories of such black-hole systems to be tested. See Letter p.426
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Sigurðsson, S. History of black holes revealed by their spin. Nature 548, 397–398 (2017). https://doi.org/10.1038/548397a
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DOI: https://doi.org/10.1038/548397a