Terrorism via the Internet? Barton Gellman has a long article in the Washington Post describing how persons unknown are using the Internet to probe various control facilities for public utilities, like dams and the electric grid, with the likely intention of terrorist sabotage that could be extremely destructive. While there is a lot of convincing detail, it raises the question: Why are these types of control systems accessible on the Internet in the first place? And why does this much detailed information need to be published? It would be of use to any saboteur.