An infrared census of accreting supermassive black holes across a wide range of cosmic times indicates that the canonical understanding of how these luminous objects form and evolve may need to be adjusted.
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Mortlock, D. The age of the quasars. Nature 514, 43–44 (2014). https://doi.org/10.1038/514043a
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DOI: https://doi.org/10.1038/514043a
