Chris KP, Dr Ray and Tall Poppy Dr Catherine, joins Dr Shane in the studio. In news, stromatolites, microfibre sensors and more data from New Horizon's Pluto flyby.

First guest is Rebecca Delconte, Walter and Eliza Hall Institute PHD student and winner of the 2017 Picchi Award for Excellence in Cancer Research. Rebecca's work has helped to advance our understanding of basic natural killer (NK) cell biology and identified NK cells as an important immune cell target in cancer immunotherapy.

Second guest Professor David Kennedy, researcher in Classics and Ancient History from the University of Western Australia, has used Google Earth imagery to identify almost 400 previously undocumented stone structures known as 'Gates' in Saudi Arabia. While we tended to think of Saudi Arabia as largely barren mountains and desert, it was also home to an immense number of archaeological sites yet to be identified.