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You probably ride escalators all the time, but do you know how they move, and flatten, and keep the handrail in synch with the steps? Find out exactly what is going on inside an escalator.
Aircraft that can alter their wing configurations in mid-flight have been in development since World War II. Now technology has finally caught up with the concept, and Northrop Grumman is in the process of building an unmanned shape-shifting plane: the Switchblade. Learn about variable-wing geometry.