Ballistic Sorting (image) Okinawa Institute of Science and Technology (OIST) Graduate University Share Print E-Mail Caption When a pebble hits a boulder it rebounds, whereas when it hits a sea of other pebbles it aggregates. Researchers term this process 'ballistic sorting.' Credit OIST Usage Restrictions None 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.