In this Wireless Philosophy video, Geoff Pynn (Northern Illinois) continues his introduction to critical thinking by examining how deductive arguments give us reason to believe their conclusions. Good deductive arguments guarantee their conclusions and so must be valid (i.e., it must be impossible for the premises to be true while the conclusion is false) and have true premises. Philosophers call such arguments /"sound/." You can tell if an argument is sound by trying to think of a counterexample to it, but to determine if its premises are true, you need to do some research.

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http://amara.org/v/Gd0j/

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