This episode of the egg timer covers Descartes's Third Meditation within his Meditations on First Philosophy.  During the Second Meditation Descartes made the case for people having absolute certainty, knowledge, that the self as a thinking thing exists in some fashion.  In his third Meditation Descartes goes further and attempts to demonstrate that people can possess absolute certainty about an external world beyond the self.  

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Art Attribution: Frans Hals  - André Hatala [e.a.] (1997) De eeuw van Rembrandt, Bruxelles: Crédit communal de Belgique, ISBN 2-908388-32-4.