A FUN FACT FOR THIS SPECIAL DAY! THE DEMON CORE WAS THE CORE OF A THIRD NUCLEAR BOMB TO BE DROPPED ON JAPAN DURING WW2. IT WAS INVOLVED IN TWO CRITICALITY ACCIDENTS AT THE LOS ALAMOS LABORATORY ON AUGUST 21, 1945, AND MAY 21, 1946, EACH OF THE INCIDENTS RESULTING IN A FATALITY.