Overlapping Speed in Friction Experiments (IMAGE) University of Pennsylvania Caption Studying atomic scale friction, teams from Penn and UC Merced helped slow experiments and fast simulations meet in the middle. Credit University of Pennsylvania 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.