This video outlines Robert Nozick's truth-tracking account of knowledge and examines how it deals with the challenge of skepticism.

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0:00 - Introduction
0:29 - What is knowledge?
2:30 - Nozick's tracking theory
16:21 - Answering the skeptic
23:36 - Do I know that I'm not a brain in a vat?
27:23 - Epistemic closure
35:03 - Abominable conjunctions
40:53 - Inductive knowledge
44:56 - What is the closest possible world?