An analysis of a sample comprising some 20,000 mass-accreting supermassive black holes, known as quasars, shows that most of the diverse properties of these cosmic beacons are explained by only two quantities. See Letter p.210
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Brotherton, M. Quasar complexity simplified. Nature 513, 181–182 (2014). https://doi.org/10.1038/513181a
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DOI: https://doi.org/10.1038/513181a