Inventors have long dreamed of creating machines that think. This desire datesback to at least the time of ancient Greece. The mythical figures Pygmalion,Daedalus, and Hephaestus may all be interpreted as legendary inventors, andGalatea, Talos, and Pandora may all be regarded as artificial life (Ovid and Martin,2004; Sparkes, 1996; Tandy, 1997).When programmable computers were first conceived, people wondered whethersuch machines might become intelligent, over a hundred years before one wasbuilt (Lovelace, 1842). Today,artificial intelligence(AI) is a thriving field withmany practical applications and active research topics. We look to intelligentsoftware to automate routine labor, understand speech or images, make diagnosesin medicine and support basic scientific research.