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James Floyd Kelly is a professional writer from Atlanta, Georgia. He has written numerous books on multiple subjects, including LEGO robotics, open source software, and building your own CNC machine as well as a 3D printer. He is the editor-in-chief of the number one MINDSTORMS NXT blog, The NXT Step (www.thenxtstep.com), where he is joined by fellow NXT experts who share their knowledge and designs with other robot fans around the world.