09:05 Russian president Vladimir Putin formally declares Crimea a sovereign state of Russia

Bill Taylor was the American ambassador to Ukraine between 2006 and 2009 – and is now the Vice President of the US Institute of Peace.

09:30 Drug policy reform - Dr Ethan Nadelmann

Dr Ethan Nadelmann, founder and executive director of Drug Policy Alliance (DPA) has played a pivotal role in most major drug policy reform ballot initiative campaigns in the USA. Expert in field of medical marijuana and legal marijuana.

09:30 Astronomers discover echoes from Big Bang        

Professor Richard Easther is head of physics at Auckland University. His work focuses on the physics of the very early universe.

09:45 US correspondent Luiza Savage

10:05 Feature: The history of New Zealand's 2,300 shipwrecks; their people and cargos -  in one visitor attraction

Wellington businessman and deep sea diver with a passion for shipwrecks. A diver of 35 years with a passion for shipwrecks, Garth McIntyre is proposing a shipwreck visitor centre on Wellington's Waterfront. His mission is to salvage artefacts from the seabed before the water claims them – especially some of the older wrecks, which are fast disintegrating.

His proposal is to build a visitors centre – the Shipwreck Heritage Institute of New Zealand – where the story of these wrecks, their people and their cargos can be told and he's prepared to dig deep into his own pockets to make it happen.

10:35 Book review with Ralph McAllister

This Dark Road to Mercy by Wiley Cash. Published by Doubleday

10:45 The Reading: 'Teetering Towards Te Aro' by Timothy Greig Nees

Set in Te Aro and peopled with the 'low lives', poets and bullshit artists who frequent the bars and dives of central Wellington. (Part 2 of 5)

11:05 Business commentator Rod Oram

Why John Key's visit to China to smooth over last year's botulism scare is potentially highly problematic.

11:20 Bryce Langston on the tiny house movement

Bryce Langston is an Auckland minimalist and permaculturist, who is building a cheap, eco-friendly and aesthetically pleasing "tiny house" to live in. He's making a documentary about the process of downsizing his life into 15 square metres, explaining why he'd want to live in a tiny space on a trailer, and exploring the wider social movement of tiny housing.

Gallery: Tiny Houses

11:45 Media Review Gavin Ellis

The difficulties of reporting a developing mystery in the case of the missing Malaysian plane, and the effect on conspiracy theorists.