Armor-piercing projectiles.

Armor-piercing projectiles made of depleted uranium have caused concern among soldiers storing and using them. Now, scientists at the Department of Energy's Ames (Iowa) Laboratory are close to developing a new composite with an internal structure resembling fudge-ripple ice cream that actually is comprised of environmentally safe materials to do the job even better. Dan Sordelet leads a research team that is synthesizing nanolayers of tungsten and metallic glass to build a projectile. "[They] are environmentally benign and eliminate health worries related to toxicity and perceived radiation concerns regarding depleted uranium."