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In the era of space asteroseismology, the \textit{Kepler} satellite enabled the measurement of the core rotation in many red giants using the splitting of mixed modes \citep{Beck:2012,Deheuvels:2012,Mosser:2012}. Mixed modes are oscillations that have an acoustic component (p-mode) in the envelope and are g-modes (restoring force is gravity) in the stellar core \citep[see e.g.,][]{Beck:2011}.  \citet{2012A&A...548A..10M} showed that it is the rotation rate  of the material near below  the active hydrogen burning shell that is most directly inferred from the splitting of mixed modes \citep[see also][]{2013A&A...549A..74M}. This measurement   of the interior rotational state of an evolved star provides a new test for   theoretical ideas of angular momentum transport.