Simulations of the cosmos cast doubt on assumptions about the temperature of primordial hydrogen gas when it was ionized by the first stars and galaxies, complicating the interpretation of ongoing observations. See Letter p.197
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Bowman, J. Cool start to hydrogen ionization. Nature 506, 163–164 (2014). https://doi.org/10.1038/nature13051
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DOI: https://doi.org/10.1038/nature13051
