This week on the show Stu talks macadamia nuts with Dr Chris Hardner from the University of Queensland and the incredible new research just published suggesting most of the world's commercial macadamia nut stock may come from one tree in Australia.Also on the show Chris pays tribute to Murray Gell-Man, whose groundbreaking research investigating particle physics led to the discovery of none other than the quark, and a fundamental shift in our understanding of our world.