Epistemology: The branch of philosophy that aims to figure out how you know what you know, and if you can know it in the first place, or if everything is just a bad dream conjured up by the Matrix. Know what I mean? Epistemologies range from the Socratic ( I know nothing) to the Popperian (all I know is what you can show), to the Humpty-Dumptian (what you know is what I say so). For example, modern day scientists follow a Popperian epistemology, whereas psychologists incline to the Humpty-Dumpty way of knowing it all.