Our Changing World for Thursday 13 April 2017

9:07 PM.The Coastwatchers were small groups of men posted to New Zealand's subantarctic islands during the Second World War to watch for enemy shipping. Ian Telfer visits one of their historic huts. Read more Audio, Gallery

9:06 PM.A project to develop and commercialise better bone grafting material using the antibacterial properties of silver nanoparticles is underway at the University of Otago. Read more Audio