The stimuli‐responsive hydrogel is a competitive material for four dimensional printing due to its good deformability, promising biocompatibility, simple manufacturing, and low cost. In article number 2000034, Shlomo Magdassi, Yi Long and co‐workers summarize the progress in hydrogel‐based 4D printed objects and devices based on their fabrication techniques, materials, and applications.

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Building energy efficiency arouses a critical concern due to its substantial contribution to global energy consumption. Windows, in particular, are often the least inefficient component of the building envelope, and...