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The cover shows the methane reforming catalytic cycle over a M–CeO2 surface. The cycle activates methane through C–H hemolytic dissociation, reducing the surface. The surface is further reduced upon product desorption, then re-oxidized by gas phase oxygen. DFT methods struggle to properly represent the localized electronic states on reduced Ce or M atoms. On page 8, Matthew D. Krcha and Michael J. Janik clarify this challenge, and review approaches to correct DFT self-interaction errors for examining redox catalysis on mixed metal oxide surfaces.