image: A printed flower consisting of multiple layers of petals that curl up as temperature increases. 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]