Hunting Hitlers Bomb

When Profesor Koeth enters his office at the university of Maryland one foggy morning, he finds a mysterious gift on his desk. The cube-shaped surprise weighs heavy in his hand. It is wrapped in a brown paper napkin and a note is attached to it: "Taken from Germany, from nuclear reactor Hitler tried to build. Gift of Ninninger." Koeth unwraps the gift. He cannot believe his eyes at first. Is it a real uranium cube? And does it really stem from an old German nuclear program?