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POWER GRIDS IN PERIL: The National Academy of Sciences has released an important new report detailing how geomagnetic storms could damage the infrastructure of modern society. An area of particular vulnerability is power grids. Ground currents induced during century-class storms can melt the huge, multi-ton transformers at the heart of power distribution systems. Because modern power grids are interconnected, a cascade of failures could sweep across the country, rapidly cutting power to tens or even hundreds of millions of people: