MIT graduate student James McLurkin, inventor of the world’s smallest self-contained autonomous robots -- measuring a little over one inch on a side -- is the winner of the ninth $30,000 Lemelson-MIT Student Prize for inventiveness. The 30-year-old native of Baldwin, N.Y., is working on his Ph.D. in computer science and building a fleet of small autonomous robots that work cooperatively to accomplish tasks. His work is being showcased in a traveling exhibition at Boston’s Museum of Science. . . . 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