Conceptual blending, say Fauconnier (cognitive science, U. of California-San Diego) and Turner (behavioral sciences, U. of Maryland), is a great mental capacity that in its most advanced, double-scope form, gave human ancestors superiority and allowed them to develop art, science, religion, culture, sophisticated tools, and language. They investigate its principles, dynamics, and role in human life. Annotation copyrighted by Book News Inc., Portland, OR.