Tunable Negative Stiffness (2 of 2) (IMAGE) HRL Laboratories Caption HRL Laboratories team achieves breakthrough in dynamically variable negative stiffness structures. Credit HRL Laboratories, LLC - All rights reserved 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.