Gray's Paradox Solved (1 of 2) (IMAGE) Rensselaer Polytechnic Institute Caption A single frame from a research video tracking the flow of water around Primo, a retired US Navy bottlenose dolphin. Credit Rensselaer/Tim Wei Usage Restrictions please include photo credit 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.