Richard Rottenburg is professor of Science and Technology Studies at the Wits Institute of Social and Economic Research (WiSER), University of the Witwatersrand, Johannesburg. The main objects of his inquiries are assemblages of evidence-making, their dependency on knowledge infrastructures and their entanglement with narrative forms of sense-making and technopolitics. Rottenburg is best known for his 2009 book Far-fetched Facts (MIT Press).Eva Riedke is assistant professor of Social and Cultural Anthropology at the University of Konstanz. Her work has focused on post-apartheid controversies and their publics; exploring the entanglements of infrastructures with processes of financialisaton; and questions of “ethics” and “values” in energy transitions. She is currently pursuing a research project on solar off grid products and lived off the grid in rural Kenya. She has contributed a series of publications on the topic.