Tousignant’s book is very strong in many of the layers of its analysis, with a particular strength in its nano level of analysis. She follows a call by the Fortuns’ (2008) to look at the subject formation of scientists in a particular context and moment. She is also strong in her analysis of the scientists’ data practices and scientific infrastructure. She includes non-human actors like the insects enrolled as indicators in Sahelian ecotoxicology as “infrastructures.” (chapter 4). She includes discussion about the racialization of expertise in chapter 2, something that I am also interested in which is often not sufficiently included in discussions of humanitarianism and science on the continent.