Opinion

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Sharing social knowledge is the foundation of our evolutionary success but in an age of unlimited information it's difficult to decide what to believe, writes Joseph Forgas.

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We naturally overestimate the risk of rare events, like shark attacks or terrorism. But there are things you can do to think more rationally about the real risk, write Ben Newell, Chris Donkin and Dan Navarro.

Cyclone Debbie

The category four cyclone – the fifth storm of this year's season, and the strongest so far – has buffeted the Queensland coast across a wide area centred on Airlie Beach, writes Liz Ritchie-Tyo.

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Like Julius Caesar, UNSW is changing its calendar for the better, writes Merlin Crossley.

nuclear bomb

Nuclear weapons threaten not merely those who have them, but all people who walk the Earth, write Toby Walsh and Rob Brooks.

social housing

Elizabeth Farrelly doesn't want to be one of the rich and powerful – she wants them to get out of the way and stop wrecking Sydney. 

Australian army

George Williams asks: What should Malcolm Turnbull do if he receives a call seeking our involvement in an ill-conceived foreign conflict? 

adult vaccination

While public health efforts focus on programs to improve immunisation rates in infants, unvaccinated adults have been ignored, warn C Raina MacIntyre, Holly Seale and Robert Menzies.

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Building a second Sydney airport will be a demanding engineering project. But the real challenge will be one of governance, writes Robert Freestone.

plastic ocean

A new documentary highlights the plight of marine animals living among the estimated 5 trillion pieces of plastic rubbish generated by humans, writes Gary Truong.

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