How do you know the floor beneath you is real? Keep asking why, like a relentless toddler at bedtime, and every justification eventually hits one of three dead ends: an infinite regress of proofs, a circular argument that smuggles the conclusion into the premise, or a dogmatic because I said so. This episode unpacks the Munchhausen trilemma, named by German philosopher Hans Albert in 1968 after the Baron who claimed to pull himself and his horse out of a swamp by his own hair.

The hosts trace the problem back to Agrippa the Skeptic and Sextus Empiricus, whose original five modes included dissent and relativity, then examine Jakob Friedrich Fries’s attempt to ground knowledge in raw perception and Karl Popper’s rebuttal that all observation is theory-laden. Albert’s ruthless version swallows deductive logic, inductive logic and the uniformity of nature, and even concedes it cannot prove itself. The way out is not certainty but fallibilism: treating our best current knowledge like software version 1.0 that ships, gets patched and keeps improving.

• The three horns explained through a parent trying to justify bedtime to a toddler
• How coherentists, foundationalists and infinitists each pick a horn and learn to live with it
• Why using induction to prove induction is a circular argument at the heart of science
• Albert’s defense against the self-defeating objection: the trilemma is a working assumption, not dogma
• Fallibilism as a practical, intellectually humble alternative to nihilism and relativism