Up, up and away (IMAGE) DOE/Sandia National Laboratories Caption Three tethered balloons were deployed both upwind and downwind of Sandia National Laboratories' National Solar Thermal Test Facility during a falling-particle receiver test. The team, led by Cliff Ho, found that the concentration of tiny particles, finer than talcum powder, that escape from the receiver were much lower than Environmental Protection Agency limits. Credit Photo by Randy Montoya/Sandia National Laboratories Usage Restrictions With 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.