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On today's program: An admission from Victoria Police that there is a problem with African street gangs in Melbourne, as community leaders warn against a blame game; We have the latest on house prices and talk to one Darwin home owner whose property value has just dived; And why you may find your usual coffee order is off the menu in some cafes.

Australia has recorded its highest number of drug-related deaths since the 1990s and medical and addiction experts warn that things need to change, including a rethink of some pain management plans, and more beds at rehabilitation clinics.

We hit the rewind button and go back to AM's slightly shaky start in 1967 and we follow the big stories, social changes and memorable moments that have unfolded since then.

The greyhound racing industry has promised to reform itself, but now we're a little way down the track, what's changed? We go track-side to speak to owners and trainers about the state of the industry today.

Health workers often say the difficult behaviour of some patients can make their jobs downright dangerous, but there's concern from mental health advocates and sufferers of mental illness that "chemical restraints" are being over-prescribed and used inappropriately.

The small Tasmanian town of Derby is in the midst of a boom brought on by the arrival of mountain bikers. But can the town balance bikes, tourism, forestry and the environment without getting the wobbles? We visit the town and take a look at how locals are managing the town's transformation.

Australia is on its way back into space if the blue-sky ambitions of a legion of enthusiastic star-gazers can be realised. The Australian Government is now in the process of establishing the nation's own space agency to marshal the efforts of Aussie boffins and entrepreneurs with their hearts set on the heavens above.

Many Australians are unaware that more than 60,000 South Sea Islanders in the latter half of the 19th century were brought to work for a pittance on farms. Now their descendants want to shine a spotlight on the shameful practices that some have dubbed "Australia's slave trade".

We pay tribute to one of the giants of Australia's broadcast media, Mark Colvin. Our tribute looks back over his remarkable career and we hear from colleagues with their reminiscences about the respected and beloved journalist.

We take a look at the emerging threat of internet warfare. What are cyber-criminals, cyber-terrorists and cyber-spies capable of doing? And what can we do to stop them?