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nanotechnology

   fabrication technology in which objects are designed and built with
   the individual specification and placement of each separate atom.
   The first unequivocal nanofabrication experiments took place
   in 1990, for example with the deposition of individual xenon
   atoms on a nickel substrate to spell the logo of a certain very
   large computer company.  Nanotechnology has been a hot topic in the
   hacker subculture ever since the term was coined by K. Eric Drexler
   in his book "Engines of Creation", where he predicted that
   nanotechnology could give rise to replicating assemblers,
   permitting an exponential growth of productivity and personal
   wealth.  See also blue goo, gray goo, nanobot.