Flexible armor (IMAGE) Massachusetts Institute of Technology Caption A steel particle is shown piercing through the nanofibrous hydrogel and exiting at a reduced velocity. The difference in velocity before and after gave the researchers a direct measurement of the material's impact resistance, or the amount of energy it can absorb. Credit Courtesy of Jiahua Ni, Shaoting Lin, Xuanhe Zhao, et al Usage Restrictions Images are made available to non-commercial entities, press and the general public under a Creative Commons Attribution Non-Commercial No Derivatives license. You may not alter the images provided, other than to crop them to size. A credit line must be used when reproducing images 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.