Richard Handl, 31, was arrested in southern Sweden in July after a raid on his home. He had been trying for months to set up a nuclear reactor in his kitchen, but became alarmed when a brew of americium, tritium and beryllium created a nuclear meltdown on his stove. Only then, he said, did it occur to him to ask the country's Radiation Authority if what he was doing was legal, and the subsequent police raid answered that question.