The Matrix as Metaphysics by David Chalmers

All of us who are involved in the skeptics movement are regularly confronted with one of two reactions when revealing ourselves as skeptics: either that we are cynics, or that, like the classic skeptics, we don't believe that anything is knowable. In this episode, Massimo and Julia take us trough the history of skepticism. From its roots in ancient Greece, to Descartes, the last rationalist, to David Hume, the father of modern skepticism, and to today's modern skeptic movement. Also, is anything really knowable? How do we know that we really exist and are not residents of a cosmic holodeck?