High-speed proton transaction (IMAGE) Deutsches Elektronen-Synchrotron DESY Caption Two neighboring urea molecules in an aqueous solution exchange protons. Credit DESY, Ludger Inhester Usage Restrictions Free use by the media if reporting on the related publication 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.