Intelligent Design: The Bridge Between Science and Theology is a 1999 book by the mathematician William A. Dembski, in which the author presents an argument in support of intelligent design. Dembski defines the term "specified complexity", and argues that instances of it in nature cannot be explained by Darwinian evolution, but instead are consistent with the intelligent design. He also derives an instance of his self-declared law of conservation of information and uses it to argue against Darwinian evolution. The book is a summary treatment of the mathematical theory he presents in The Design Inference (1998), and is intended to be largely understandable by a nontechnical audience. Dembski also provides a Christian theological commentary, and analysis of, what he perceives to be the historical and cultural significance of the ideas. Overview Dembski begins by analyzing signs from God in the Bible, and notes that such signs have specificity and complexity, which enables them to be clearly discernible. He considers this to be a general insight regarding recognition of the "Divine Finger", and states, "My aim in this book is to take this premodern logic of signs and make it rigorous." A review of naturalistic criticisms of miracles, particularly those by Benedict Spinoza and Friedrich Schleiermacher, follows. Dembski critiques the critiques, and derides the methodological naturalism that, he says, is part of their legacy. He then focuses on the history of natural theology in Britain, recounting the teleological arguments of William Paley and Thomas Reid, and the primary reason for their demise, the Darwinian theory of evolution by natural selection. Upon introducing it, Dembski immediately criticizes it and commends the critique of Charles Hodge, who he says argued that Darwinism "was trying to subsume intelligent causation under physical causation." Intelligent design, the central idea of the book, is then introduced. He distinguishes it from theistic evolution and, especially, purely naturalistic evolution. Explaining a motivation for it, he states, "Darwinism is the totalizing claim that [natural selection] accounts for all the diversity and complexity of life. The evidence simply does not support this claim.... [There] is always a temptation in science [to] think that one's theory encompasses a far bigger domain than it actually does." He lists numerous phenomena that he claims have proven to be "utterly intractable" for natural selection, including the origin of life, the origin of the genetic code, and the Cambrian explosion. Then comes the technical theory. He