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Retrieved on: 2018-01-24 17:22:30
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<div>NASA's version doesn't need that kind of machinery: it relies on the properties of a temperature-activated material called <b>shape memory alloy</b> instead. Upon being heated, the alloy activates a twisting motion in the tubes serving as the wings' actuator, moving the wings' outer portion up to 70 degrees ...</div>
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