Columbia University Engineers, funded by the Defense Advanced Research Projects Agency (DARPA), have developed a “robot metabolism” process that gives robots the unusual ability to consume other robots and use their components to heal, grow, and improve themselves. In a statement, the researchers behind the ominous-sounding work say that the ability of robots to maintain and potentially improve their physical components and capabilities, while artificial intelligence systems are already expanding their own autonomous capabilities, is a necessary step toward “self-sustaining robot ecologies.” Unlike biological organisms, robots lack the ability to change, repair, or improve their physical state without outside assistance....