This book succeeds in its stated intention of giving an overview of the development of information theory. Human beings are "decoders" who interpret information. Scientific theories are human creations seeking to enlighten. The author explains a basic explanation from information theory, i.e., that "in an ordinary conversation, information is conveyed when the speaker says something that changes the listener's knowledge." Campbell attacks Darwin's theory, writing, "One major difficulty is that the central argument of Darwinian theory circles back on itself, explaining nothing." He goes into detail on why evolution is unscientific. The brain makes decisions along the way as to what information it will process and how it will interpret what it takes in.