The natural pulse of a red-giant star provides crucial insight into what makes it shine. Observations of red giants by the Kepler space telescope shed light on a previously untested prediction of stellar evolution theory. See Letter p.608
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Metcalfe, T. The inner lives of red giants. Nature 471, 580–581 (2011). https://doi.org/10.1038/471580a
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DOI: https://doi.org/10.1038/471580a
