4 ta small factory in Concord, New xVHampshire, workers at the startup Nanocomp Technologies are turning carbon nanotubes into paper-thin sheets many meters long. The nanotubes, which are each just a few billionths of a meter wide, are among the strongest and most conductive materials known. For decades researchers have dreamed of using them to make super-efficient electrical transmission lines, suspension bridges that can span several kilometers, and even elevators that convey satellites into space.
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