Iron Carbide Wire (IMAGE) Rensselaer Polytechnic Institute Caption The iron carbide wire thins and moves through the nanotube as it collapses. Credit Johannes Gutenberg University/Banhart 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.