At a cost of $3.5 billion and more than a decade of work, the 192 laser beams are billed as the most powerful in the world.Scientists working at the National Ignition Facility of the Lawrence Livermore National Laboratory in California, have built the most powerful laser in the world, capable of simulating the energy force of a hydrogen bomb and the sun itself. “The system already has produced 25 times more energy than any other laser system,” said NIF Director Ed Moses. The Energy Department is expected to announce Tuesday that it has officially certified the National Ignition Facility, which...