Leibowitz and Agassi: Conversations on Philosophy of Science - Part 11

The eleventh episode of the fascinating and iconic series of dialogues between Professor Yeshayahu Leibowitz and Professor Joseph Agassi, "Leibowitz and Agassi: Conversations on the Philosophy of Science," likely focuses on one of the most intriguing core themes in the field—the complex and charged interplay between science and ideology, or perhaps between science and objective truth and its limits. Based on the nature of these discussions and the well-known positions of both intellectuals, one can assume the conversation revolved around the question of scientific rationality: whether science is a purely objective construct or if it is influenced by social, cultural, and ideological factors. The philosophical backdrop for the discussion was presumably marked by the key thinkers of the philosophy of science. David Hume, the father of empiricism and skepticism, serves as a necessary reference point in any debate regarding the boundaries of scientific knowledge and the problem of induction—how science validates its generalizations based on specific observations. Karl Popper, Agassi’s mentor and one of the most influential philosophers of the 20th century, undoubtedly sits at the heart of the discussion with his theory of falsification. Popper argued that scientific theories can never be absolutely verified, only refuted. A true scientific theory is one that is falsifiable, and scientific progress is the process of debunking theories and replacing them with new, superior ones. Conversely, Thomas Kuhn—who challenged the linear, cumulative view of science and proposed the concept of "scientific revolutions"—may have been positioned as a counterpoint or a complex complement to Popper. Kuhn argued that science does not develop solely through refutation and reconstruction, but through deep paradigmatic shifts where the entire frame of reference changes, not just individual theories. Thinkers like Ernst Mach and Émile Durkheim likely informed the discourse on social influences; Mach with his empirical-phenomenalist approach suggesting science is an organization of sensations, and Durkheim with his emphasis on the collective's role in establishing consciousness and concepts. Naturally, classical scientific milestones, such as the transition from Newton to Einstein and the Copernican Revolution, likely served as guiding threads to demonstrate the shift between paradigms and theories. Professor Leibowitz, in his trademark style, surely presented his sharp and incisive anti-metaphysical worldview. He viewed science as a unique human activity but likely emphasized the fundamental distinction between "facts" (as described by science) and "values" (as chosen by man). For Leibowitz, science is not a source of values or ultimate meaning; it describes *how* the world works, not *why* it exists or *what* we ought to do within it. In his view, science is free from subservience to any ideology or belief, while simultaneously remaining a mere tool, entirely value-neutral. As both a philosopher of science and a practicing chemist, Leibowitz was adept at demonstrating the necessary distance between scientific inquiry and metaphysical or religious assertions. On the other hand, Professor Agassi, as a prominent student of Popper, surely championed the Popperian principles of constant self-criticism and falsification. For Agassi, the heart of science lies not in the search for confirmation or certainty, but in a theory's capacity to be tested and proven wrong. Scientific rationality, by his definition, is expressed not by the absence of error, but by the willingness to admit error and seek better alternative theories. Agassi likely insisted that criticism is the engine of scientific progress, and that without a readiness to scrutinize every theory under a harsh light, science tends toward stagnation or ideological deviation. He would have been critical of any attempt to "save" scientific theories through ad-hoc arguments or of theories that are inherently unfalsifiable. The central tension that likely emerged in the conversation touched upon whether science is truly "objective" in the pure, Popperian sense, or if it is always tainted by external factors—social, psychological, or ideological. Leibowitz may have stressed the rigorous distinction between the activity of the scientist (who is influenced by their world and choices) and the product of science (the theory itself, which must be independently verifiable). Agassi, for his part, might have argued that while scientists are social beings, this does not doom science to be ideological; rather, there are critical mechanisms within science that help purge it of subjective biases. They may have also questioned the limits of criticism—whether every scientific paradigm can be critiqued, or if there are certain foundational assumptions that remain beyond challenge. The dialogues between Leibowitz and Agassi, and this episode in particular, serve as a cultural and educational document of immense importance within the Israeli context. They embody the richness of intellectual debate in a bygone generation. These conversations played a vital role in making complex philosophical concepts accessible to the general public while teaching critical thinking. Beyond the specific topics, the dialogues themselves were a lesson in intellectual engagement, listening, and respecting one's peer even amidst profound disagreement. For an Israeli public accustomed to political and military debates, this series opened a window to a different kind of discourse—deep, reasoned, and nuanced—thereby enriching public life and contributing significantly to scientific and philosophical literacy. It set a high standard for intellectual inquiry and left a profound mark on Israeli culture.

Video transcript