Electron-Proton Interactions (IMAGE) University of the Basque Country Caption The charge density of an electron (in blue) changes its form due to the interaction with photons (in red). Credit © J.M. Harms/MPSD Usage Restrictions © J.M. Harms/MPSD 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.