Hiroshima after the US military dropped the atomic bomb on 6 August 1945.
Peace Memorial Museum
Kwame Nkrumah and Ali Mazrui associated nuclear weapons with imperialism and racism, but proposed different approaches to address the problem they present.
Behrouz Kamalvandi, left, spokesman for Iran’s atomic energy agency, listens to a man wearing a surgical mask, an official with the Ahmadi Roshan nuclear site in Natanz, Iran, during a news conference on May 20, 2019.
IRIB News Agency via AP
Nearly 50 years old, the treaty has been signed by 190 countries – more than any other arms limitation treaty. But now Iran is threatening to withdraw.
Israel has a powerful air force — and it’s not afraid to strike neighbors it perceives as a national security threat.
AP Photo/Ariel Schalit
The US isn't the only country considering a military response to Iranian aggression.
Saudi Arabia has many possible motives for pursuing nuclear power.
Exporting nuclear technology is lucrative, but without strict safeguards, buyers could divert it into bomb programs. Why is Saudi Arabia shopping for nuclear power, and should the US provide it?
Kim Jong-un arrives in Singapore.
Can decades of deadlock be broken by two of the world's most unpredictable leaders?
After decades of deadly enmity, Libya and the West made a major breakthrough on weapons of mass destruction. How?
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.
Malcolm Turnbull: not at all in the middle.
Canberra's attitude to nuclear weapons has always been riddled with contradictions. Homegrown nuclear campaigners winning the Nobel prize have put the cat among the pigeons.
War of words (for now).
Trump seems to think all potential nuclear agitators are alike. He's wrong, and perhaps disastrously so.
People have been rising up against nuclear weapons ever since the first one was used – and it hasn't been for nothing.
The Doomsday Clock has been advanced to two and a half minutes to midnight. But what does that mean?
EPA/Jim Lo Scalzo
It's two and a half minutes to midnight according to the Doomsday Clock. But what is the clock and why should we pay attention?
The Department of Energy’s National Nuclear Security Administration supervises the removal of 68 kilograms of highly enriched uranium (enough for two nuclear weapons) from the Czech Republic in 2013.
Former Texas Gov. Rick Perry has experience with energy, but if confirmed as secretary of energy, he should get ready to learn a lot about DOE's big jobs: nuclear security and basic science research.
It could all have been for nothing.
The global nuclear non-proliferation regime depends on American leadership. What if Donald Trump loses interest?
More than 70 years after the Hiroshima bombing, a majority of countries are pushing for a legally-binding treaty against nuclear weapons.
In early December, the nations of the world are poised to take an historic step on nuclear weapons. Yet Australia sticks out like a sore thumb among Asia-Pacific nations in arguing against change.
Voice of America
After North Korea's fifth nuclear test on Sept. 9, the U.S. is calling for tighter global sanctions. New research shows that this strategy actually helps North Korea.
A computer design for home manufacturing of a receiver, the trigger and firing part, of a semi-automatic rifle.
Beyond making guns at home, 3D printing could help countries secretly develop nuclear weapons and terrorists stage more effective attacks. How do we protect innovation and ourselves?
‘A-Day’ marked the first of 23 atomic bomb explosions at Bikini.
Department of Energy
In the summer of 1946, the U.S. government detonated the first of many atomic bomb tests in the Marshall Islands. Seventy years of radiation exposure later, residents are still fighting for justice.
Korean War-era weapons on display in South Korea. More than six decades on, tensions are unresolved – and now they are nuclear.
The West has long depended on the nuclear deterrent to quell the threat of 'rogue' nations like North Korea. But Pyongyang's continued nuclear weapons program shows that global disarmament is the only answer.
On August 6, 1945, a crude bomb containing 60 kilograms of highly enriched uranium exploded 580 metres above Hiroshima.
EPA/Hiroshima Peace Memorial Museum
Today's nuclear arsenals are so powerful that dropping a Hiroshima-size bomb every two hours for 70 years would not exhaust their destructive capacity. The global disarmament regime is broken.
A nuclear-capable Pakistani missile during testing in 2011. The international community hopes other aspiring nuclear nations can develop nuclear power without the military muscle.
Through history, nuclear power has gone hand in hand with the nuclear arms race. But does it have to be this way? Closer international cooperation can help nations embrace nuclear power peacefully.