Gray's Paradox Solved -- Dolphin DPIV (VIDEO) Rensselaer Polytechnic Institute This video is under embargo. Please login to access this video. Caption Research video: Measuring the water flow around Primo, a retired US Navy bottlenose dolphin. Credit Rensselaer/Tim Wei Usage Restrictions please include video 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.