Little by little, nanotechnology has emerged amid enormous aspirations for newmaterials and fantastic promises of manipulating our world “atom by atom.” Whilethese grand visions continue to capture the imaginations of various audiences—andcontinue to be contested, as well—nanotechnology has developed into more than that.During the last two decades, many research programs and industrial R&D expenditureshave resulted in actual products and tangible innovations. Nanotechnology, it seems, isexpanding. But what does it mean to say that nanotechnology is expanding?