Some psychologists claim to have demonstrated that humans are systematically, deeply and perhaps irredeemably irrational in their reasoning and decision making. But what is rationality and why does it matter? If we are really so irrational, how have we managed to get this far as a species? Maybe rationality isn't such a big deal after all. Tune in as Ken Taylor and guest host Nadeem Hussain size up the human mind with Stephen Stich from Rutgers University, author of From Folk Psychology to Cognitive Science: The Case Against Belief.

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