This article examines the influential Chinese science book "Brush Talks from Dream Brook," written by Shen Kuo in the 11th century. I suggest that "Brush Talks" reveals a tension between institutionalized science and science in the public, and a gap between the making of scientific knowledge and the communication of such knowledge to the general public. In writing "Brush Talks," Shen preserved and popularized grassroots science and technology in the most respected medium of his time--the printed book. In the article, I ask what formal elements of this book reveal about the choices Shen made as a literati author to connect to his primary readers, most of which were middle and lower class lay audiences. As I will argue, he used three approaches that aided him in speaking to the public about science and technology--an ethnographic approach to knowledge, innovative uses of genre, and a straightforward writing style.