 At the time, it was striking that Kuhn compared revolutionary transitions, rather than normal scientific developments, with evolutionary change. It seems clear that he did not consider revolution and evolution to be mutually incompatible. But keep in mind that, for him, normal science represents periods of stasis, whereas revolutions are short, highly creative periods that more closely resemble the exploration by random trial and error (p. 87) that we associate with biological evolution. Examined on a minute time scale, however, normal science arguably also involves a (more constrained) variation and selection process, as scientific practitioners search for ways to articulate the paradigm. So, given the inevitability of evolution under such conditions, Kuhn’s treatment of normal science would appear to be too static. The important point here is that, in Kuhn’s view revolution and evolution are compatible when considered on the correct time scales (see Wray 2011 and Kuukkanen 2012). Examined from afar, revolutions are simply the more noteworthy episodes in the evolution of the sciences. Examined up close, they (like discoveries in general for Kuhn) have a detailed structure that is evolutionary, even something as revolutionary as the quantum theory (Kuhn 1978).