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Molecules that arrange themselves into predictable patterns on silicon chips could lead to microprocessors with much smaller circuit elements.
March 16, 2010 -- The features on computer chips are getting so small that soon the process used to make them, which has hardly changed in the last 50 years, won’t work anymore. One of the alternatives that academic researchers have been exploring is to create tiny circuits using molecules that automatically arrange themselves into useful patterns. In a  paper that appeared Monday in Nature Nanotechnology, MIT researchers have taken an important step toward making that approach practical. 
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There is the gray goo problem that can destroy us, but also on the optimistic side almost instant cures of cancers from nanobots injected into our blood stream.