What influence is climate disinformation having on tackling climate change, and what are the tipping points that may see the end of the greyhound industry globally. As Nazis reappear on the streets of Sydney, we revisit the investigation team that tracked down Nazis living in Australia after World War Two. Also the challenges of retrieving digital archives from floppy disks. The final  Boyer Lecture is presented by James Curran, author and professor of modern history at the University of Sydney.