After more than 60 years of work, scientists have made a breakthrough that could potentially change the future of energy. The Lawrence Livermore National Laboratory and the Department of Energy announced this week that they had successfully achieved energy-producing nuclear fusion that produced more energy than they put into it. U.S. Energy Secretary Jennifer Granholm called it a huge achievement for science and for clean energy. Marketplace’s Kimberly Adams spoke with Carolyn Kuranz, an experimental plasma physicist at the University of Michigan’s department of nuclear engineering about how the experiment worked.