Michial Farmer moderates a conversation with David Grubbs and Dr. Nathan Gilmour about epistemology, the philosophical investigation of how we know what we know. A central concern of philosophy since the 17th century and a valid question before that, epistemology comes in a definite range of options. Among the thinkers and ideas discussed are Plato, Thomas Aquinas, Descartes, Locke, Hume, Kant, Hegel, Pierce, Kuhn, and micro-fairies.