Perdigão Scientists (IMAGE) U.S. National Science Foundation Caption Perdigão scientists study valley meteorology and the "wake" of the wind turbine in the background. Credit Perdigão Experimental Group Usage Restrictions None 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.