 Margolis (1993) notes the importance of the phenomenon of “contagion,” in which new ideas or practices suddenly reach a kind of social tipping point and spread rapidly. Contagion is, of course, necessary for a revolt to succeed as a revolution. Today, contagion is a topic being studied carefully by network theorists and popularized by Malcolm Gladwell’s The Tipping Point (2000). Steven Strogatz, Duncan Watts, and Albert-László Barabási are among the new breed of network theorists who are developing technical accounts of “phase changes” resulting from the growth and reorganization of networks, including social networks of science—a topic dear to the early Kuhn’s heart as he struggled with the themes of Structure (see Strogatz, 2003, chap. 10; Watts 1999; Newman 2001; Barabási 2002; Buchanan 2002).