The Structure of Scientific Revolutions contains some nice observations on the nature of what Kuhn calls “normal science”, which makes it out to have none of the heroic aspects that Popper insisted on. But when Kuhn goes beyond normal science to “revolutionary science” the book is a disaster. It promotes an irrationalist view of scientific revolutions that is both false and pernicious. The Copernican Revolution is a lovely book, much needed at the time. Planck and the Black Body Discontinuity is a mixed bag: some good historiography and some poor analysis.