For the first time, scientists have produced a fusion reaction that created more energy than was expended, a breakthrough to tap into the same kind of energy that powers the sun and stars. It could have huge implications for potentially creating clean and limitless energy. Science Correspondent Miles O'Brien joined Judy Woodruff to discuss what was achieved and what still needs to happen. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders