2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16511An introduction to Extremal Optimization written for the Computer Simulation Column in ``Computing in Science and Engineering'' (CISE).8 pages, RevTex, 5 figures, for related papers, see http://www.physics.emory.edu/faculty/boettcher/#EO . This work has been submitted to the IEEE for possible publicationDisordered Systems and Neural Networkstext