There are few science fiction buzzwords as powerful as nanotechnology. Any time an author or filmmaker needs to explain away some future technology that isn't quantum in nature, it's nanotech. Visions of intelligent, swarming, microscopic robots arriving to heal our every ill (or devour the flesh from our bones) populates every corner of our futuristic stories with little more than a hand-waving explanation. Increasingly, however, these technologies are becoming a reality.