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Brad Cox , a faculty member of the George Mason University Program on Social and Organizational Learning, which concentrates on overcoming socioeconomic and technical obstacles to change, believes nanotech is headed down the wrong path. Otherwise, to build something as simple as a housefly is purely ridiculous. At its heart is the creation of an empire of tiny programmed robots called assemblers, so small that they will be able to work with individual molecules of matter. A race of these nano-robots could be programmed to produce any substance, structure, or entity allowed by the laws of nature. Wired Digital Inc., a Lycos Network site.