"THE AMOUNT OF FISSILE MATERIAL USED IN THE NUCLEAR WEAPON THAT DESTROYED NAGASAKI WAS A LITTLE SMALLER THAN A BASEBALL, MAYBE MORE LIKE A CUEBALL," GALLUCCI TELLS NPR. "ARE WE GOING TO VERIFY DOWN TO THE LEVEL OF 5 OR 6 CUEBALLS IN NORTH KOREA? I DON'T THINK SO."