Front Cover: In article number 1900516, Yiming Wang, Xuhong Guo, and co-workers report supramolecular hydrogels with on-demand thermo-responsiveness that are prepared through a simple mineralization process. The resulting hydrogels can be tuned from the type with a lower critical solution temperature (LCST) to an intermediate state with both a LCST and an upper critical solution temperature (UCST), and to that with a UCST.