Ancient ripples (IMAGE) Stanford University Caption The SandAI neural network was trained using modern quartz sand and can help unravel the histories encoded in ancient rocks. Shown here are ancient ripples formed by water currents being reworked by modern wind-blown sediment in Oman. (Image credit: Mathieu Lapôtre) Credit Mathieu Lapôtre/Stanford University Usage Restrictions N/A License Original 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.