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In the Letter [PRL 102, 085703 (2009)] Brambilla, et al. claimed to observeactivated dynamics in colloidal hard spheres above the critical packingfraction of mode coupling theory (MCT). By performing microscopic MCTcalculations, we show that polydispersity in their system shifts the criticalpacking fraction above the value determined by van Megen et al. for lesspolydisperse samples, and that the data agree with theory except for, possibly,the highest packing fraction.

Comment on "Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition"