How do contemporary philosophers respond to the threat of skepticism?  In this Wireless Philosophy video, Jennifer Nagel (University of Toronto) reviews the semantic (or meaning-based) theories of Hilary Putnam and David Chalmers, according to which skepticism either self-destructs, or isn’t as scary as you might think.  She then examines the defensive approach of Timothy Williamson, an approach whose goal is not to convert you from being a skeptic back into believing in knowledge, but rather to protect you from becoming a skeptic in the first place.