Back Cover: The fabrication and morphologies of three‐dimensional polystyrene‐block‐polydimethylsiloxane (PS‐b‐PDMS) nanostructures confined in the nanopores of anodic aluminum oxide (AAO) templates are studied. The block copolymers wet the nanopores using a novel solvent‐annealing‐induced wetting method. In addition, the morphologies of the PS‐b‐PDMS nanostructures are controlled by changing the wetting conditions. These three‐dimensional nanostructures can serve as nanotemplates for refilling with other functional materials. Further details can be found in the article by C.‐J. Chu, P.‐Y. Chung, M.‐H. Chi, Y.‐H. Kao, and J.‐T. Chen* on page 1598.