image: A "4-D printed" structure can be transformed from its permanent shape into many different shapes that are structurally stiff at room temperature and then returned to its permanent shape by applying heat. This material relates to a paper that appeared in the April 12, 2017 issue of Science Advances, published by AAAS. The paper, by Z. Ding at Singapore University of Technology and Design in Singapore, and colleagues was titled, "Direct 4D printing via active composite materials." view more
Credit: [Credit: Ding <i>et al.</i> Sci. Adv. 2017;3:e1602890]