Provides an explanation to the lay reader of the science of artificial evolution. In recent years humans have built systems that approach the complexity of nature and these mechanical systems have shown unforeseen signs of life, evolution and learning. The author refers to these systems as Emergent Worlds. The law of the Emergent World is that no one can be in control. For the book, Kevin Kelly has interviewed the leading researchers in the field. Kevin Kelly is the editor of Whole Earth Review.