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Cornell has designed a robot made of identical modules that can reproduce itself (http://www.mae.cornell.edu/ccsl/research/selfrep/selfrep_brief5.pdf). The article suggest that self-reproduction "is a continuum dependent on the amount of information being copied", referencing to a metric developed by Adams and Lipson. An ABC News article is available at http://abcnews.go.com/Technology/wireStory?id=748180.