The majority of papers in this special issue were presented at a conference, ‘The Advancement of Science and the Dilemma of Dual Use: Why We Can’t Afford to Fail’ held on 9–10 November 2007. The conference chairman was Andrzej Górski and its patrons were UNESCO and the President of the Polish Academy of Sciences. Three additional papers on the subject of Dual Use have been included in this issue; the authors are T. A. Cavanaugh , J. Forge and D. Koepsall.