 What is ignorance? Is it just the absence of knowledge? Or is there more to it than that? The sum of our ignorance is much greater than the sum of our knowledge. But how much do we really know about ignorance? Where does it come from? How do we impose it on each other and even on ourselves? And why? What roles does ignorance play in social interaction, group relations, institutions, law, and managing risk? We usually think of ignorance as a bad thing, but when can it be preferable not to know something? When can ignorance be good or bad for us? Can ignorance sometimes be a virtue? I'm Mike Smithson. And I'm Gabriel Bama. And we're the coordinators of Igno101x, the online course about ignorance. For five weeks, we invite you to voyage with us through the vast terrain of ignorance, learning about its guises and roles, how and why it exists, and how people deal with it. Ignorance is everyone's business. Ignorance is relevant to every discipline and profession and to everyday life, both at work and at play. No matter what domain you study or work in, this course will have something to offer you. Register now for Igno101x on edX and find out how to understand ignorance, how to manage it, and how to deal effectively with the unknowns in your life.