yuan4dFour-dimensional (4D) printing ceramics is a challenge due to their weak deformability. Here, the authors report a hydrogel-dehydration-driven direct 4D printingMISSION. 4D Bio 3 Center promotes the development and application of advanced biotechnologies and services within the DoD to enhance the readiness, health, and well-being of America's Warfhters, veterans, and families