A Star in New Jersey February 25, 2015 Flora Lichtman In a fusion world, we'd generate unlimited clean energy from mini suns that we build all over Earth. Sound like a fairytale? Scientists at Princeton Plasma Physics Lab say we can get there -- if we can pay for it. "Well, fusion is one of the most difficult things we've ever undertaken and by 'we' I mean humankind," lab director Stewart Prager says. Adam Cohen, deputy director of operations, gives us a tour.