Circuit. Last week, I had the opportunity to give the keynote speech at our local Friends conference in Philadelphia. Friends is the National Association of Young People Who Stutter, and I gave an update on the science of stuttering, including our genetic studies. However, rather than starting with the zebra finches or images of the unusual representation of speech in my own brain, I started my talk by showing the book cover of The User Illusion. This book made me interested in neuroscience in the first place, and I thought that the underlying theme is a great introduction to the mysteries of human fluency. Here are my thoughts.