Greedy reductionism, identified by Daniel Dennett, in his 1995 book Darwin's Dangerous Idea, is a kind of erroneous reductionism. Whereas "good" reductionism means explaining a thing in terms of what it reduces to (for example, its parts and their interactions), greedy reductionism occurs when "in their eagerness for a bargain, in their zeal to explain too much too fast, scientists and philosophers ... underestimate the complexities, trying to skip whole layers or levels of theory in their rush to fasten everything securely and neatly to the foundation". Using the terminology of "cranes" (legitimate, mechanistic explanations) and "skyhooks" (essentially, fake—e.g. supernaturalistic—explanations) built up earlier in the chapter, Dennett recapitulates his initial definition of the term in the chapter summary on p. 83: "Good reductionists suppose that all Design can be explained without skyhooks; greedy reductionists suppose it can all be explained without cranes."