With the laser just over half a century old, another dream of the pioneers of this light source has been fulfilled. An atomic X-ray laser with unprecedentedly high photon energy has been demonstrated. See Letter p.488
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Marangos, J. Even harder X-rays. Nature 481, 452–453 (2012). https://doi.org/10.1038/481452a
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DOI: https://doi.org/10.1038/481452a
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