Scientists at the Air Force Research Laboratory are exploring the use of carbon nanotube-based twistron yarns for energy generation. This twistron yarn image, captured by x-Ray tomography, is a 3-D rendering of the coiled nanotube fibers and provides information on the structures, defects and interfaces internal to the fibers at the nanoscale. By examining the twistron yarns at the micro-level, researchers hope to better understand the dynamic process of energy generation by the yarns under deformation. (U.S. Air Force photo/Matt Lucas)