It would have many uses including military applications, radar tracking: A universal mirror, an object that reflects all light waves back at their source, has been created by scientists in Europe and Asia. Imagine a tennis player hitting a ball against a wall. The ball would bounce right back to the player no matter what angle he or she directed the shot. A universal mirror has the same effect, except with light waves. Unlike an ordinary mirror, which only reflects objects at 90 degrees, a universal mirror reflects objects back at any angle. In other words, a person positioned in...