Ice nucleation (IMAGE) Hong Kong University of Science and Technology Caption Ice nucleation on foreign surfaces can proceed via both one-step (magenta arrow) and two-step (orange arrows) pathways, facilitated by the balanced synergetic, entropic effects of hexagonal (green spheres) and rhombic (purple spheres) ice structures. Credit The Hong Kong University of Science and Technology Usage Restrictions Photo credit to the Hong Kong University of Science and Technology License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.