In a lab east of San Francisco, physicists trained 192 lasers on a plastic sphere the size of a BB. Inside were ingredients for a powerful fusion reaction similar to the kind that makes our sun hot and glowing.
When they switched the lasers on, the Lawrence Livermore National Laboratory scientists found that more energy came out of the fuel than went in. The research, reported in February, is a crucial milestone toward tapping the power of lab-made fusion.
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