 The account of the dynamics of science in Structure ill fit the rapid splitting and recombining of fields in the post-World War II era of Big Science, as Kuhn recognized. So he excluded from his account the division and recombination of already mature fields such as happened with the emergence of biochemistry. (This exclusion is troubling, given the universal thrust of his account. It is as if Kuhn admitted that his account applies only to a particular historical period that is now largely past; yet he also wrote as if the normal-revolutionary model would apply to mature disciplines into the long future.) In his later work he did devote careful attention to the division of fields into specialties and subspecialties (see §5). However, he still gave little attention to the more-or-less reverse process of new fields coming into existence by combinations of previously distinct fields as well as to cross- and trans-disciplinary research, in which a variety of different specialists somehow succeed in working together (Galison 1997, Kellert 2008, Andersen 2013).