This schematic shows an engineered material with composite layers. Layers of carbon fibers (the long silver tubes) have microscopic forests of carbon nanotubes between them (the array of tiny brown objects). These tiny, densely packed fibers grip and hold the layers together, like ultrastrong Velcro, preventing the layers from peeling or shearing apart. Credit: Courtesy of the researchers, edited by MIT News To save on fuel and reduce aircraft emissions, engineers are looking to build lighter, s...