Jonathan Simon teaches philosophy of science at the Université de Lorraine (in Nancy) and is a member of the Archives Poincaré (UMR 7117). Trained in the history and philosophy of science at the LSE and in the Department of History and Philosophy of Science of the University of Pittsburgh, he has taught in the US, Australia and France. His research work has been on the history and philosophy of pharmacy and chemistry. https://orcid.org/0000-0003-2265-6863 Bertrand Henri Rihn, MD, DSc, professor of biochemistry and molecular biology at Université de Lorraine, France, is a leading expert in the field of particulate toxicology, with research topics including safety toxicology, mechanistic toxicology and immunotoxicology by investigating transcriptomic changes in macrophages following man-made particles and nanoparticle exposure. He is the head of the ‘Nanomaterials and Health’ team at the Institut Jean-Lamour (Nancy, France) where he is initiating a new research field devoted to the study of the interaction (toxicity and biocompatibility) of macrophages and new implant alloys. In addition to his research, Professor Rihn has also worked as clinical laboratory investigator in bacteriology and virology and is Medical officer-in-Chief at French Defense Central Health Service (Service de Santé des Armées) involved in medical and sanitary support of the French army. He was awarded the Baratz Award (2004) and the Taub Award (2011) from the French National Academy of Medicine and served as the president of the French Society of Toxicology from 2007 to 2009.