Rehealing and recycling of the device. (a) Schematic illustration (top) and experimental microscope images (bottom) of the rehealing process. (b) Optical images of the original strain sensor (top) and after cutting and rehealing three times (middle). The rehealed strain sensor can be stretched by 100% (bottom). (c) Schematic illustration of the recycling process. (d) Optical images of the recycling of an amplifying circuit. (e) Optical images of the original strain sensor (top) and after recycling for once (middle) and three times (bottom).