Bruce Shaprio on the US President's latest ultimatum for Iran.  Prof.Assa Doron reveals how India has become the global epicentre for the world's antibiotic resistance problem. And anthropologist Luke Taylor celebrates the artistic legacy of the late Peter Marralwanga, the master bark painter of West Arnhem Land. 

• Bruce Shapiro, Executive Director at the Global Centre for Journalism and Trauma, Contributing Editor with The Nation
• Professor Assa Doron, anthropologist at Australian National University, co-author of A world of resistance: India and the global antibiotic crisis (with Alex Broom), Harvard University Press
• Luke Taylor, anthropologist and co-author of Peter Marralwanga: Painter of the Djang of Western Arnhem Land (with Ivan Namirrkki), ANU Press