Grid cells confer a spatial impression of an animal's environment on the brain. Their firing patterns in a cave-dwelling bat reopen old questions about how they do this, and pose some compelling new ones. See Letter p.103
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Colgin, L. Periodicity without rhythmicity. Nature 479, 46–47 (2011). https://doi.org/10.1038/479046a
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DOI: https://doi.org/10.1038/479046a
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