Slick Ice Covers a Footpath (IMAGE) American Institute of Physics Caption Slick ice covers a footpath, reducing friction and making walking more dangerous. Bo Persson, a scientist at the Jülich Research Center in Germany, has developed a new theory to describe ice friction. Credit Simon A. Eugster via <a target="_blank"href="https://commons.wikimedia.org/wiki/File:Black_ice_on_footway.jpg">Wikimedia Commons</a> Usage Restrictions Creative Commons Attribution-Share Alike <a target="_blank"href="https://creativecommons.org/licenses/by-sa/3.0/deed.en">3.0 Unported</a>, <a target="_blank"href="https://creativecommons.org/licenses/by-sa/2.5/deed.en">2.5 Generic</a>, <a target="_blank"href="https://creativecommons.org/licenses/by-sa/2.0/deed.en">2.0 Generic</a> and <a target="_blank"href="https://creativecommons.org/licenses/by-sa/1.0/deed.en">1.0 Generic</a> license. You may select the license of your choice. 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.