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	15d Descartes on knowledge, certainty, and skepticism - Descartes's cogito - I think, therefore I am (khanpadawan) View
	15a Descartes on knowledge, certainty, and skepticism - the concepts of knowledge, skepticism (khanpadawan) View
	15c Descartes on knowledge, certainty, and skepticism - methodological skepticism, deception (khanpadawan) View
	Doubting (Carneades.org) View
	Descartes and Certain Knowledge: Cogito Ergo Sum (Athena Productions) View
	15b Descartes on knowledge, certainty, and skepticism - Meditations, methodological skepticism (khanpadawan) View
	Doubting (Carneades.org) View
	# 8 Skepticism Part 4: Cartesian Doubt (dfpolis) View
	Descartes' Epistemology (BlueSpectacles) View
	I Think Therefore I Am thought - Descartes (Desteni) View