That resulted in Language: The Cultural Tool in 2012. Looking around, I couldn’t see a textbook on field methods that taught young linguists how to do the kind of culture-language research that I considered essential, so I co-authored (with Jeanette Sakel), Linguistic Fieldwork: A Student Guide, also in 2012. Next there was a gap in the literature on what culture was. So I wrote Dark Matter of the Mind: The Culturally Articulated Unconscious, in 2016, in order to remedy this with a book that proposed a new theory of the connections between cognitive science, linguistics, and culture. After this, I realized that I needed to show how language and culture got to have the relationship that they have in the history of human evolution. So I wrote How Language Began: The Story of Humanity’s Greatest Invention, W.W. Norton, 2017. And now, just when I thought I might have everything behind me and be able to move on to a pet project on the evolution of cognition, I recognized another gap, a philosophy of language to undergird my theory of cognitive science, linguistics, and culture. Therefore, I am currently working on Peircean Linguistics: A Chapter in the History of Empiricist Thought (not coincidentally, this is similar to a 1966 book by Chomsky, Cartesian Linguistics: A Chapter in the History of Rationalist Thought – I believe that Descartes’ philosophy never really panned out well for linguistics and that C.S. Peirce’s semiotics and pragmatism provide a much better foundation for linguistics as I conceive of it).