Sudden Impact (image) American Physical Society Share Print E-Mail 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. Share Print E-Mail 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.