Leibowitz and Agassi: Conversations on Philosophy of Science - Part 6

The sixth installment in the captivating series "Leibowitz and Agassi: Conversations on the Philosophy of Science" continues to enthrall and challenge the viewer, delving into the very heart of the philosophy of science. In this segment, the discussion likely centers on the limits of science, the nature of scientific knowledge, and specifically, what distinguishes science from other fields of study. Given Agassi’s distinct Popperian background and Leibowitz's unique approach to science and religion, the core of the debate probably revolves around falsification, scientific rationality, and the relevance of metaphysics to science. Professor Agassi, a prominent student of Karl Popper, tends to emphasize the principle of falsification as the central criterion for distinguishing between science and non-science. For Popper, and subsequently for Agassi, a scientific theory is not built upon infinite empirical confirmation (induction), but rather on its vulnerability to being proven wrong. As long as a theory withstands the test of experience and refuses to be refuted, it remains a provisional scientific theory, perpetually awaiting the falsification that will propel science forward. This approach stands in contrast to classical inductive methods where researchers, inspired by David Hume, grappled with the problem of justifying inferences from particulars to general rules. As early as the 18th century, Hume observed that there is no rational justification for believing that future events will conform to past ones, thereby undermining the logical foundations of induction. Popperian falsification offers a partial solution to this dilemma by shifting the emphasis from verification to refutation. Conversely, Leibowitz, a philosopher of immense stature in his own right, presents a categorical and uncompromising distinction between fact and value. For him, science deals exclusively with facts—the description of the world as it is—whereas values belong to the realms of religion, ethics, and faith. Leibowitz views science as a human activity whose essence is the eradication of ignorance and the engagement in pure cognition, devoid of any axiological or metaphysical goals. He is staunchly anti-metaphysical in his scientific views, regarding any attempt to conflate facts with values as a dangerous conceptual confusion. Consequently, any talk of "purpose" or "meaning" within science is alien to his perspective. In this sense, Leibowitz likely views with skepticism any attempt by philosophers of science to grant science a metaphysical or spiritual role, or even to address the question of scientific "truth" as understood outside the narrow cognitive domain. The central tension emerging from this dialogue, as one might expect, lies between viewing science as a pure act of eradicating ignorance and describing facts (Leibowitz), and viewing it as a dynamic process of formulating hypotheses and seeking refutations (Agassi/Popper). A key question that likely arises is whether there is a clear criterion for distinguishing a scientific theory from a non-scientific one, and how practical or applicable this criterion truly is. Historical precedents, such as the transition from Newtonian physics (once considered absolute and stable) to Einsteinian relativity, demonstrate how established theories can be undermined to make way for new ones. Thomas Kuhn, for example, in his model of scientific revolutions, emphasized the role of "paradigms" and the difficulty of falsification within an existing paradigm, contrasting with the Popperian ideal of constant refutation. Agassi would surely point to these scientific revolutions as evidence of the importance of falsification, while Leibowitz might emphasize the transition from one description of reality to other facts, disregarding the socio-historical dimensions that characterized Kuhn's work or Popper’s polemic against it. The discussion may also touch upon other key concepts: does scientific rationality require every theory to be open to falsification? Is there a place for latent metaphysical assumptions in science, as argued by thinkers such as Ernst Mach or Émile Durkheim, who referred to deep conceptual structures that shape scientific thought? Leibowitz would undoubtedly oppose viewing science as open to metaphysical influences, highlighting instead the immanent and internal nature of science itself, which attempts to describe reality as it is, without any external or internal goal transcending the boundaries of cognition. The significance of the "Leibowitz and Agassi" conversation series as an Israeli cultural and educational document is immense. It represents an intellectual discourse of the highest caliber, where two sharp and critical minds meet. They represent distinct yet complementary philosophical approaches that deeply reflect the intellectual and cultural tensions within Israeli society. These conversations are not merely a lesson in the philosophy of science; they are a living demonstration of the capacity for profound, reasoned, and uncompromising cultural debate, where each side presents its position with absolute clarity while fostering a fertile intellectual tension. It exposes the complexity of the giants of scientific history and serves as an inspiration for generations of students and researchers to think critically about knowledge, science, and their roles in our lives.

Video transcript