Leibowitz and Agassi: Conversations on Philosophy of Science - Part 8

In the eighth installment of the captivating series *Leibowitz and Agassi: Conversations on the Philosophy of Science*, two intellectual giants descend into the profound depths of scientific knowledge and its evolution, focusing on the crisis of modernity and its impact on human perception. At the heart of this discussion lies the complex and provocative realm of "scientific revolutions"—a concept that became a cornerstone of 20th-century philosophical dialogue, largely thanks to Thomas Kuhn. Through this lens, the conversation grapples with fundamental questions regarding the continuity or disruption of knowledge, the power of paradigms, and the degree of rationality—or lack thereof—found in the transition from one scientific theory to another. A rich tapestry of thinkers and ideas provides the foundation for this intense debate. Karl Popper, the father of falsificationism and Agassi’s mentor, looms large over the discussion. Popper’s approach, which views falsification as the spearhead of the scientific method and the criterion distinguishing science from pseudoscience, echoes throughout the dialogue. Standing in contrast is Thomas Kuhn, who argued that scientific progress is not linear and cumulative, but occurs in leaps through paradigm shifts that are not always strictly rational. Historical figures such as Newton and Einstein serve as classic examples of such revolutions—from the birth of classical mechanics to the paradigm-shattering theory of relativity. The discussion may also invoke David Hume, whose critique of induction necessitated an alternative to verification, and Ernst Mach, who deeply influenced the interpretation of relativity. Even sociologist Émile Durkheim might be mentioned for his perspectives on the social structure of knowledge. The distinct positions of the two professors clash and merge around these issues. Leibowitz, in his signature anti-metaphysical stance, views science as a human activity—sophisticated, yet driven by human needs and interests rather than the pursuit of an independent "objective truth." He insists on a sharp, unbridgeable divide between fact and value, arguing that science is limited to describing and predicting facts; it possesses neither the authority nor the capacity to dictate values or goals. For him, scientific revolutions are primarily shifts in a world-view born of human perceptual needs, not necessarily linear progress toward an absolute truth. Opposing him is Agassi, Popper’s loyal yet critical student. Agassi represents a distinct Popperian line, emphasizing falsification as the core of science and its primary engine of progress. He contends that scientific revolutions are the result of a constant process of refutation, where old theories are discarded to make way for more comprehensive ones. While Agassi acknowledges the existence of non-rational or "psychological" elements in paradigm shifts, he insists on the supremacy of critical examination. The tensions raised in this discussion are manifold. Does science progress rationally toward objective truth, or does it move through irrational leaps and incommensurable paradigms? What is the role of falsification in this process—is it always the driving force, or is it sometimes a byproduct of social and psychological pressures? How can one reconcile Leibowitz’s view of science as a mere human construct with Agassi’s view of it as an objective quest for truth through refutation? Furthermore, the conversation inevitably touches upon the complex relationship between science and religion, questioning whether these fields overlap or exist in entirely separate domains, especially in a modern era where scientific authority is often treated as a "new religion." This entire series, and particularly complex chapters like Part VIII, serves as a monumental Israeli cultural and educational document. It represents a summit of intellectual giants engaging in a philosophical dialogue that is profound, sharp, and yet accessible to the public. These discussions, which refuse to compromise on depth, serve as a model for public discourse. They demonstrate how fundamental philosophical issues can be discussed in an enlightening way, respecting opposing views while striving for clarity. In doing so, the series remains a vital contribution to philosophical education, encouraging critical and independent thought in all who watch it.

Video transcript