Former Russian spy Alexander Litvinenko died in a London hospital in 2006, after drinking tea poisoned with the highly radioactive material - polonium. But who wanted him dead, and why?

She suspected the presence of an even more powerful element. MARIE-NOELLE HIMBERT: Here, Po, Polonium is the first element that they discovered. CHRIS PACKHAM: It’s remarkable, isn’t it?

It might sound like an absolutely bonkers gimmick, but back in the days when we were still in our honeymoon phase with atomic energy, popular cereal brand General Mills’ KiX offered the “Atomic Bomb ...