DAVID ROBERTS: Well, epistemology is the branch of philosophy that deals with knowledge basically, how we gain knowledge and what justified belief it consists in. Basically, how we know things and what it means to know something.
CHRIS HAYES: The thing that I loved about philosophy is, you take a very banal, obvious thing, and start asking questions, and within a few questions you would be like, "Whoa."
DAVID ROBERTS: Exactly. You realize that no one knows anything.
CHRIS HAYES: We don’t actually have any answers, right? So, when someone says to me, "How do you know the world is round?" Right? I say, "Well, it was taught to me." "Well, who taught it to you?" "Well, my teachers." "Well, how do they know?" "Well, scientists." "Well, which scientists?" "I don't know." "How'd the scientist know?" Actually as I'm playing this out right now, I don't actually know the answer to that. Like, I literally I don't know the answer to the question of ... well, obviously now we have satellites and all that stuff, but like before we got into space, like how did they know, but they knew, right?
