Have you ever questioned your assumptions about the world? Ever wondered if things are as you believe and ""know"" them to be? Ever wondered if how you know, is providing accurate information on how things really are? We all seek the assurance of certainty. We want to be confident that we are living in the real world, not in fantasy or illusion. And yet, paradoxically, this driving need is the origin of much despair and suffering, for we live in a...