Post-truth, a legacy of the epistemological debate of the modern age. An educational proposal

This work is a philosophical itinerary for secondary school students, living in the post truth age. We start with the debate spurring from R. Descartes' mind-world gap, followed by Locke's and Hume's attempts to fulfill it and by the Kantian synthesis, that left the "thing as it is in itself" to unknowability. Such debate is to be considered the background of post-truism actuality. Afterwards we consider the psychological causes of manipulation and case studies of post-truism political leaders. Finally comes a bit of the New Realism philosophy as a tool to deconstruct skepticism and lies.