Pilot-Scale Burns (IMAGE) Proceedings of the National Academy of Sciences Caption Pilot-scale burns of 100 square-foot plots of standing grass indicating that plots treated with viscoelastic fire retardant fluids weathered extensively and exposed to the environment do not burn, while untreated plots burn within 1 min. The images were taken 1 min after ignition.� Credit Image courtesy of Jesse D. Acosta. 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.