The Island of Stability was an area where super-large were stable and useful. It was a difficult goal.
For a long time, it was thought that there were only 92 elements on the periodic table. But in the 1940s, a scientist named Glenn Seaborg discovered neptunium and plutonium while working for the Manhattan Project. Overtime, he extended the Periodic Table to 106 elements. The last of these was Seaborgium, named after the scientist himself. In the 1970s and beyond, the periodic table was extended even further by Seaborg's student Ken Moody. New elements would continue to be discovered for years. But they were all unstable for a time. With the advent of picotechnology, however, the island of stability which Ken Moody predicted in the 1970s was found.
Tech Level: 12-13
The Island of Stability was a revolution. Transuranic elements became useful for the first time. Especially elements 114-126. Because the isotopes were stable, they could be used. This made them useful for reactors, medicine, fuel, etc. Creating more stable isotopes of heavy elements was possible, but picotechnology also allowed for metastable allotropes to be created.