David Simpson, Okinawa Institute of Science and Technology (OIST) Graduate University (image) Okinawa Institute of Science and Technology (OIST) Graduate University Share Print E-Mail Caption David Simpson gathers samples of swine wastewater from the Okinawa Prefectural Livestock and Grassland Research Center in Nakijin, Okinawa. Credit OIST Usage Restrictions Use appropriate credit. 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.