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Scientific knowledge has been under attack recently, especially during and from the Trump administration. This article discusses the value of research in social studies of science in relation to scientific practice and post‐truth attacks on science. This literature analyzes the expert work and social values that enter into the production of evidence, the development and testing of methods, and the construction of theoretical and epistemological frames for connecting evidence, methods, and methodologies. Although researchers in this area argue that there are politics in science, this article demonstrates that their analyses of the processes of adjudicating evidence and epistemologies contribute to science. In contrast, post‐truth attacks on scientific expertise exemplify a particular kind of politics aimed at supporting a particular group's political and economic interests. 

In this article we examine the history of the production of microarray technologies and their role in constructing and operationalizing views of human genetic difference in contemporary genomics. Rather than the “turn to difference” emerging as a post-Human Genome Project (HGP) phenomenon, interest in individual and group differences was a central, motivating concept in human genetics throughout the twentieth century. This interest was entwined with efforts to develop polymorphic “genetic markers” for studying human traits and diseases. We trace the technological, methodological and conceptual strategies in the late twentieth century that established single nucleotide polymorphisms (SNPs) as key focal points for locating difference in the genome. By embedding SNPs in microarrays, researchers created a technology that they used to catalog and assess human genetic variation. In the process of making genetic markers and array-based technologies to track variation, scientists also made commitments to ways of describing, cataloging and “knowing” human genetic differences that refracted difference through a continental geographic lens. We show how difference came to matter in both senses of the term: difference was made salient to, and inscribed on, genetic matter(s), as a result of the decisions, assessments and choices of collaborative and hybrid research collectives in medical genomics research.