The Group of Chief Scientific Advisors met for the fiftieth time on 15 September. Seven scientists, appointed in a personal capacity and chaired by Adam Izdebski and co-chair Mangala Srinivas, meet regularly to work through the advice in preparation, requests from Commissioners, and topics that may come next. When a Commissioner asks a question, a SAPEA working group assembles the evidence. The Advisors then decide what follows. They are rarely specialists in that topic, and that distance is the point: their task is to judge what a body of evidence can support and put it in terms a policymaker can act on. They can do that from an interdisciplinary perspective.