Our Changing World for Thursday 19 June 2014

9:49 PM.In this Spectrum programme, recorded in 1996, Alistair McAlpine joins Joan Wiffen on a fossil hunting trip in her favourite Hawke's Bay stream. Audio

9:46 PM.A team of University of Otago researchers has developed an iPad app to help people practise sight-singing music at home. Read more Audio

9:34 PM.An international group of experts have suggested a new way of ranking invasive aliens by environmental impact to produce 'Black Lists' Read more Audio

9:20 PM.Three estuarine monitoring buoys have been installed in the Kaipara Harbour to identify sources of fine sediment pollution Read more Audio

9:06 PM.A tribute to Joan Wiffen, a self-taught palaeontologist who discovered New Zealand's first dinosaur bone in a Hawke's Bay streambed in the 1970s. Read more Audio