lucid, engaging and thought-provoking

Irish Mail, Simon Humphreys

wide-ranging, accessible and lively

Engineering and Technology, Dominic Lenton

Aha! is a remarkable work of insight into how the mind really works. So many of our thoughts and ideas are not the product of deliberative rational computation, but instead seem to bubble up from where we know not, spontaneous creations that we are only now beginning to study. William Irvine spans the spectrum of human cognition in many areas of life, and does so in a highly readable narrative. I had many aha moments myself while reading this book!

Michael Shermer, Publisher of Skeptic magazine, monthly columnist for Scientific American, author of The Believing Brain and The Moral Arc

In this fascinating, instructive book, William Irvine explores the various conditions and methods by which exceptional people have invited revelation, solved problems, or simply stumbled onto life-changing discoveries and insights. As he traces individuals' paths toward epiphanies large and small, Irvine discusses the roles of cultural environment, genetics, brain function, and more. There is no single formula or blueprint for an 'aha' moment, he suggests, though getting to that moment usually requires an open, curious mind. Aha! is a significant addition to the literature of invention, perception, and creativity.

Ann McCutchan, author of The Muse That Sings

With wide-ranging erudition and elegant style, Aha! is a fascinating study of the Eureka! phenomenon. In addition to asking how ideas happen, philosopher William B. Irvine delves deeply into how ideas transform us, individually and as a society, analyzing them from a variety of perspectives: psychological, evolutionary, sociological, and even political. Original, thought-provoking, and just a good read, this book is brimming with insights about moments of insight.

Elliot Samuel Paul, philosophy professor at Barnard College, Columbia University, and co-editor of The Philosophy of Creativity