Putting government dollars to excellent use, scientists at U.C. Berkeley are honing in on a real-life invisibility cloak. » 8/11/08 12:20pm 8/11/08 12:20pm Two new "metamaterials" - artificially engineered structures not found in nature - refract light at a nanoscale level, creating the illusion of invisibility. One is a "type of fishnet of metal…