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http://en.wikipedia.org/wiki/Universal_assembler

  • a "proposed device able to guide chemical reactions by positioning reactive molecules with atomic precision".
  • This is a heart of a "nanofactory"
  • If nanofactories could be built, severe disruption to the world economy would be one of many possible negative impacts, though it could be argued that this disruption would have little negative effect if everyone had such nanofactories. Great benefits also would be anticipated.