Baffled by Higgs bosons, quantum mechanics, and the accelerating expansion of the universe? This year's physics Nobel Prize is for something that's reassuringly understandable and useful: the blue LEDs used in everything from home lighting and headlights to TV screens and traffic signals. Three researchers
helped revolutionize lighting with vastly better energy efficiency and brightness. The light-emitting diodes also are used in data storage, TVs, and smartphones.
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