What is Epistemology?, Thales says Everything is Water, Anaximander says Everything is Air, Rene Descartes, Discourse on the Method of Rightly Conducting One’s Reason and of Seeking Truth , Skepticism entry at the Stanford Encyclopedia of Philosophy, The New England Skeptical Society, music by podington bear (nature kid), image credits: leap, annonymous, god hands, puppeteer, brain in vat, baby hands, bre, brain messages, scary girl, poltergeist kid, trees, fame guy, brain neurons, space pics (1, 2)