Surfaces That Keep the Ice Away

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Ice is a hazardous fact of winter life, playing havoc with roads, utility lines, buildings, and air travel. Conventional methods of getting rid of the ice, such as direct heating, applying salt, or using chemicals to trigger melting, all have liabilities: they can corrode the materials they're applied to, and damage the environment, and they are only modestly or temporarily effective. But Harvard scientists say they have created materials that can prevent ice from forming on surfaces in the first place.