Mark Oliphant in 1939.
From a collection at the National Portrait Gallery, Canberra. Gift of Ms Vivian Wilson 2004
Australian scientist Mark Oliphant helped push the development of nuclear weapons during World War II but later riled at US attempts to keep the UK and others out of the nuclear arms race.
After decades of deadly enmity, Libya and the West made a major breakthrough on weapons of mass destruction. How?
Iranian demonstrators burn a picture of the U.S. President Donald Trump.
AP Photo/Vahid Salemi
Does the work of the international agency responsible for verifying whether Iran was in compliance with the deal matter to the US?
He said he’d do it, and he has.
Iran is a dangerous mischief-maker in the Middle East – but scrapping the nuclear deal will probably make things worse.
An International Atomic Energy Agency inspector at Iran’s Natanz facility, 2014.
AP Photo/IRNA, Kazem Ghane
Who do you call when there's a nuclear crisis? The International Atomic Energy Agency, unless the crisis involves North Korea -- then things get complicated.
Netanyahu “exposes” Iran.
Israel's prime minister failed to undermine the validity of Iran's nuclear deal, and instead ended up demonstrating just how important it is.
“Have you read The Art of the Deal? Nor have I.”
Donald Trump has always traded on his image as a master dealmaker – but many deals have been done with North Korea before.
EPA/Korea Summit Press Pool
The astonishing sight of two Korean leaders crossing the border that divides them is just a first step.
Denis_kh via Shutterstock
To understand how a new world war might play out, it's important to remember just how powerful the US really is.
Headline of a planned summit between Kim Jong Un and Donald Trump.
AP Photo/Ahn Young-joon
A former US Department of Defense and State Department official explains why a hard-line approach on North Korea will likely fail, as it did with Iran.
North Korean leader Kim Jong Un.
A scholar who has profiled leaders like Saddam Hussein and Vladimir Putin says there is a method to understanding the madness.
U.S. President Donald Trump and North Korean leader Kim Jong Un featured in a South Korean news program.
What scholars know about the past, present and future of the US' relationship with North Korea, as the two countries' leaders prepare to meet.
Thanks to South Korea, there is a chance for peace with North Korea. Whether the Trump administration can take it is another matter.
Could the solution to a nuclear North Korea lie in arbitration?
Trump and Kim are due to meet this spring. But if these talks fail could international arbitration provide - as it has in the past - an alternative way out of the North Korean crisis?
Watching from the south.
A year ago, productive north-south talks seemed inconceivable – but with the US tripping over its own feet, things are changing.
Nuclear reactors line the bank of the Columbia River at the Hanford site in 1960.
During the Cold War, the US built nuclear weapons at a network of secretive sites across the nation. Some are still heavily polluted and threaten public health today.
Warning sign at Kerr-McGee uranium mill site near Grants, N.M., December 20, 2007.
AP photo/Susan Montoya Bryan
The Trump administration's push for 'energy dominance' could spur a new wave of domestic uranium production. A scholar describes the damage done in past uranium booms and the visible scars that remain.
North Korean women’s ice hockey players.
North and South Korea explained in five questions and answers.
With artificial intelligence weapons on both sides, are we in a new cold war?
As tensions between the US and Russia escalate, both sides are developing technological capabilities, including artificial intelligence that could be used in conflict.
A flag with Korean peninsula unification symbol at the opening ceremony of the Sydney 2000 Olympic Games.
North Korea has taken up the South's invitation to the Olympics, but a quick look at the history of North-South talks suggests that unity is not as close as it may seem.