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Union-led campaigns across NSW are telling voters to put government MPs last on their ballot papers – a strategy that helped elect Labor in Queensland earlier this year. Stop the Sell Off/Facebook

In a tight NSW election, optional preferences could win the day

The way Queensland voters chose to exercise their preferences was crucial in the shock defeat of the state’s first-term conservative government. Could that happen again in this weekend’s NSW election?
Locating Nova Sagittarii 2015 No. 2, the new bright light in the sky. Alex Cherney

Ancient nova is now thought to be a stellar collision

A new light in the southern night sky is thought to be an exploding star. It comes as astronomers reveal an ancient nova explosion is now thought to have been two stars colliding.
One of the major works on display in The Photograph and Australia at the Art Gallery of NSW, Tracey Moffatt’s I made a camera (2003). Photolithograph. Collection of the artist. © Tracey Moffatt, courtesy Roslyn Oxley9 Gallery, Sydney. Art Gallery of NSW.

The Photograph and Australia: the curator and the exhibition

A major photography retrospective opened at the Art Gallery of NSW on the weekend, but what does The Photograph and Australia tell us about our present and past?
The Franklin River which would prove to be Fraser’s environmental undoing. anna/Flickr

Fraser paved the way for a national environment policy

Malcolm Fraser may be remembered for his failure to intervene in the Franklin Dam campaign, but he otherwise led a government distinguished for its environmental action.
Some people may be turned on knowing their sexual activities are being monitored by experts. Yves Hanoulle/Flickr

Health Check: why some people have sex for science

The who, how, and what of sex-based laboratory studies may all be a little problematic, so can we generalise from their findings?
NSW Labor has promised a Great Koala National Park to protect koalas, but what about more insidious threats to the environment? Nicki Mannix/Flickr

Key environment policy still unknown in the NSW election

NSW has nearly 300 threatened animal species, including koalas and pygmy-possums. Yet we still don’t know the government’s plans in one area that could pose a serious threat to NSW’s wildlife.
Research has found some children become narcissists because their parents teach them they are more special than other kids. Shutterstock

Why some children think they’re more special than everyone else

Narcissistic children feel superior to others, believe they are entitled to privileges and crave admiration from others. When they don’t get the admiration they want, they may lash out aggressively. Why…
Cryptographic algorithms have been in a constant arms race with systems seeking to crack them. Yuri Samoilov/Flickr

Encryption today: how safe is it really?

Encryption has come a long way since the days of Sparta and Rome, but it’s still not 100% secure.
Even in retirement, the late Lee Kuan Yew cast a long shadow from which Singapore has yet to fully emerge. EPA/Stephen Morrison

Lee Kuan Yew leaves behind an ambiguous legacy in Singapore

Lee Kuan Yew literally helped put Singapore on the map. Its subsequent influence far outstrips the tiny island’s geopolitical significance.
Security experts discovered that the iVote practice server was vulnerable to tampering; after checking that the same weakness affected the real voting server, they alerted the authorities. Vanessa Teague and Alex Halderman

Thousands of NSW election online votes open to tampering

UPDATED 3PM: The NSW Electoral Commission has now publicly commented on the security flaw we uncovered. But we’re concerned that it does not seem to understand the serious implications of this attack.
Vanuatu has a well-co-ordinated disaster response system but limited material resources. Medical support is needed when a disaster like Cyclone Pam strikes. EPA/UNICEF

Beyond Cyclone Pam: identifying Vanuatu’s strengths and needs

The people of Vanuatu have always had to cope with extreme weather events, but natural disasters on the scale of Cyclone Pam test their strengths and leave areas of vulnerability exposed.
New modelling shows the Medicare rebate freeze will leave GPs A$8.43 worse off per consultation. DIBP images/Flickr

High cost of GP rebate freeze may see co-payments rise from the dead

With GPs facing greater economic pressure and the health minister considering legislative change to make it easier for GP to charge them, GP co-payments, like Lazarus, may rise again from the dead.
Rio Tinto’s Mount Thorley-Warkworth mine in the Hunter Valley, which looks set to expand further. The NSW planning department says it would “not be reasonable” to require Rio Tinto “to completely or even partially backfill the final void”. Lock The Gate Alliance/Flickr

Disused mines blight New South Wales, yet the approvals continue

There are hundreds of derelict mine sites across New South Wales – and the state planning department has admitted it is “not aware of the total size” of large mining voids currently being left behind.