In contemporary healthcare, everybody seems to want more data, on more people, and use them for ever more purposes. There are many good reasons for such ambitions, and yet it is becoming obvious that the current data intensification generates not just stories of benefit and success, but also complaints about misunderstandings, meaningless work, and unintended consequences. In his book, Data Paradoxes (MIT Pres, 2023), Klaus Hoeyer outlines and describes why we tell such different – almost opposing stories about data, and why very different stories might all be partly true. How can we use such insights productively – not least in an age where also cross-border data integration is high on the political agenda?Klaus Hoeyer is professor of Medical Science and Technology Studies at the Centre for Medical STS, University of Copenhagen. His research focuses on the links between policy, practice and experience in medical research and clinical practice. In recent years, he has focused mainly on the increased emphasis on collection, storage, use, reuse of health data, and how these data practices change the health services. This research is primarily financed by the European Research Council.