The failure of Nazi Germany’s nuclear program is well established in the historical record. What is less documented is how a handful of uranium cubes, possibly produced by the Nazis, ended up at laboratories in the United States.

Scientists at the Pacific Northwest National Laboratory and the University of Maryland are working to determine whether three uranium cubes they have in their possession were produced by Germany’s failed nuclear program during World War II.

The answer could lead to more questions, such as whether the Nazis might have had enough uranium to create a critical reaction. And, if the Nazis had been successful in building an atomic bomb, what would that have meant for the war?