Despite humans having read for thousands of years, we still don't understand everything about how it happens.  It is still a mystery of how the eye, mind, and the brain are called upon to perform tasks that are fundamentally 'unnatural'.  Dr. Adrian Johns, Chair of the Department of History at the University of Chicago, joins us to talk about how all this has been explored throughout history, laid out in his new book The Science of Reading: Information, Media, and Mind in Modern America.