The new advancement in lightweight body armor is the result of research that Army and University of Delaware scientists began more than a decade ago. ARL Inside explores the development and testing of shear thickening fluid, a nanotechnology invention that, when applied to fabric like Kevlar, for example, prevents pointed weapons like spikes or ice picks from penetrating between its yarns, and generally helps to hold yarns and fibers in place during attacks from pointed weapons or projectiles. Someday, researchers say, this liquid could be used to treat Soldier uniforms, particularly sleeves and pants, which are not protected by ballistic vests, and have to stay flexible.