Ultralight Fractal Materials (IMAGE) American Physical Society Caption Materials assembled in fractal shapes could be helpful for building solar sails and other structures that must be both very light and strong. Credit Daniel Rayneau-Kirkhope, Yong Mao , and Robert Farr, <i>Physical Review Letters</i> Usage Restrictions None License Licensed 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.