A pair of airmen inspect a crack on the runway to determine its severity at Ellsworth Air Force Base, S.D., July 19, 2013. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released) DARPA to develop bio-inspired tech to ‘self-heal’ Pentagon’s deteriorating concrete structures Officials involved were inspired by vascular systems that support repair in multicellular organisms and ecosystems. Jun 6, 2022 By Brandi Vincent