MOSCOW (Reuters) - A Russian atomic scientist surrendered eight containers filled with arms-grade nuclear material to police Tuesday after keeping it in his garage for eight years, Russian media reported. Leonid Grigorov found the 14 ounces of plutonium-238 in a heap of rubbish at his laboratory near Russia's border with Kazakhstan, Itar-Tass news agency said. Interfax news agency said the lab, looted after the Soviet collapse in 1991, was eventually closed and deserted. Grigorov decided to hide the material, which could theoretically be used to make a "dirty bomb," in a box and only handed it in to local police...