Sudden Impact (IMAGE) American Physical Society Caption A sequence of high speed images reveals the plume thrown up when a sphere crashes into a layer of sand. Credit Gabriel Caballero et al. Physical Review Letters Usage Restrictions Contact the authors or the American Physical Society for permission to reproduce this image. 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.