Why are we so innovative? Where do new ideas come from? Why are human beings so exceptionally good at innovation, leaving other species mentally in the dust? How can we hold onto new ideas once they are formed? This book explores the claim that the human spark, the source of innovation and the origin of ideas, was an advance that occurred in a particular kind of mental operation, which Turner calls blending. Blending is our ability to take two ideas or more and create a new idea from the "blend." And what is so fascinating is how human beings are able to engage in blending almost without...