Scientists at the Institute for atomic weapons research were experimenting with new sources of nuclear energy and came up with these highly radioactive marbles that can set off a powerful chain reaction when they reach the end of a firing tube. However, further research has shown that the weapon design isn’t feasible because the marbles detonate prematurely and can blow up the entire building, radioactive marbles,chain reaction,explosion,atomic weapons research,premature detonation,scientific experiment,catastrophic event,high-stakes mission,prevent explosion,firearm safety,adventure,action,science,danger