Sensors can analyse the surface of materials and, using the amount of resistance they show, work out the force to apply to an object.

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His service in the United States Army from 19431977 included an assignment with the Office of Strategic Services that involved parachuting into occupied France to work with the Resistance to support the Allied invasion.

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But with resistance to wind subsidies growing, backers of marine energy now have their work cut out to prove that such largesse is justified.

ECONOMIST: A remote town hopes to become a clean-energy hub