Tech CEOs and consultants call every minor update a paradigm shift, but the phrase was popularized by a physicist turned philosopher whose original meaning was far more radical. This episode follows Thomas Kuhn from his birth in Cincinnati in 1922 through progressive schooling in New York that prized inquiry over memorization, a Harvard physics degree in 1943, wartime radar work in Europe, and a PhD in 1949. We explain how a request from Harvard president James Conant to teach the history of science, and a three-year junior fellowship, led Kuhn to read Aristotle’s physics and realize he had been judging it through a Newtonian lens.

After Harvard denied him tenure in 1957, Berkeley gave him a platform, where he interviewed Niels Bohr the day before Bohr died. His 1962 book The Structure of Scientific Revolutions introduced normal science, anomalies, crisis, revolutionary science, and incommensurability, the claim that rival paradigms cannot be compared with a neutral yardstick. We examine the backlash that accused him of making science a popularity contest, his clash with Karl Popper’s falsifiability, his rejection of relativist followers with the declaration that he was not a Kuhnian, his five values for theory choice, the Polanyi plagiarism dispute, and his late-career shift toward language and an evolutionary model of scientific speciation before his death in 1996.

• Why Aristotle’s physics makes perfect internal sense once you step inside his worldview
• How the smartphone update analogy captures normal science but fails to capture a true paradigm shift
• Why Newtonian and Einsteinian physicists cannot even agree on what the word time means
• Kuhn’s five criteria for a good theory: accuracy, consistency, scope, simplicity, and fruitfulness
• Whether modern political polarization is a case of societal incommensurability