"The Structure of Scientific Revolutions" by Thomas Kuhn. Science is not a purely additive process. New facts and theories are not simply added to the pile of

"The Structure of Scientific Revolutions" by Thomas Kuhn. Science is not a purely additive process. New facts and theories are not simply added to the pile of existing ones. New knowledge and understanding often requires abandoning or drastically reconceiving old theories and observations. Kuhn explores this in great detail, and I found it fascinating and insightful. For example, prior to the invention of the telescope, the celestial sphere was viewed as fundamentally different from the earthly sphere. But a simple look at the moon in Galileo's telescope reveals it to be a body that is very similar to the Earth. It has mountains which cast shadows as the light moves across them, and so on. The "moon" must now be be viewed as a rather different concept, and this new conception is invoked every time one looks at it. This new "paradigm" affects other observations, such as those of Jupiter and Saturn. They are not pure, static points of light like stars, and some color and a circular shape can be see with the new telescope. Must they be bodies like that of the Moon or Earth as well? In the book, as Kuhn presents his analysis, it seems we are also taking a deep look at epistemology, and the subtleties and differences between how something is perceived and how it is conceived. Grounded in the historical narrative of scientific advancement, I found this investigation of those difficult and elusive topics to be more enlightening than usual. I believe that some criticize Kuhn for how sharp and discontinuous he describes his paradigm shifts to be. For me, this was not a main point. I enjoyed his detailed analysis of how paradigms change in general, and why this is a more accurate description of how science progresses, compared to additive models.