Professor Richard Easther, from the University of Auckland joins Emile Donovan to explain.

The former prime minister died yesterday.

Ben Kennedy is a Professor at the School of Earth and Environment at the University of Canterbury. and joins Emile Donovan.

A Low Hum's Ian Jorgensen joins Emile Donovan to talk about the project.

New Zealand Men's curling team skipper, Anton Hood joins Nights.

Mayor-elect Nandor Tanczos joins Emile Donovan.

Each year, an estimated 4 million tonnes of plastic waste from urban and industrial centres ends up in marine environments. Rivers and waterways act like giant conveyor belts, carrying the waste to estuaries, beaches and oceans. And while we know a lot about how plastics travel once they're in the ocean, we know less about their journey there. Now a new tracking device is set to help change that and hopefully reduce the amount of water pollution. The device was designed and developed by Dr Peter Cleveland, who did his PhD at AUT and now lives in Vietnam and Singapore. He joins Mark Leishman.

Dan Shepherd is part of Blind Low Vision New Zealand, where he works as the General Manager of Community and Inclusion. He joins Mark Leishman.

Our European correspondent Christian Smith joins Mark Leishman from London.

John Driscoll is from the Rotary Club of Ashburton, he's one of the people behind the Bookarama, and he joins Mark Leishman.