Today, only 14 cubes remain accounted for out of more than 1, 000 used by the Nazis in unsuccessful experiments with weapons of mass destruction.... After the fall of Adolf Hitler's Germany in 1945, Allied forces transported at least 659 cubes of the fissile material to the United States.... What happened to the cubes after they arrived in America remains a mystery, however, with only a handful of research institutions still in possession of the dangerous Nazi relics. One such cube unexpectedl