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At the height of the Cold War, the United States and the Soviet Union put their nuclear weapons on hair-trigger alert, ready to retaliate against a surprise attack. Even now, decades later, the United States and Russia combined have about 1,700 missiles armed, aimed, and ready to fire in minutes.

What if a warning of an incoming attack turns out to be false—but a U.S. or Russian president doesn’t learn that until after ordering a retaliatory strike? What if a command-and-control system is hacked to spoof an incoming attack?

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This is a game, but nuclear threats are real.

Join the Nuclear Threat Initiative, a nonpartisan, non-profit global security organization reducing nuclear and biological threats imperiling humanity. Get our updates or visit our Safer World Action page to see how you can help build a safer world.

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The Hiroshima anniversary: 5 things you should know about nuclear weapons today

The imprint on public consciousness of the atomic bombing of Hiroshima…has faded greatly. The hibakusha, or survivors of the atomic bomb attacks on Hiroshima and Nagasaki, Japan, which killed more than 130,000 and left tens of thousands of others with horrendous injuries, have been the most ardent proponents of nuclear abolition. Now they are few in number, and nuclear-armed states seem deaf to their pleas. By Michael Krepon in Vox.

All you wanted to know about nuclear war but were too afraid to ask

In this Nuclear 101, the Guardian’s Julian Borger and Ian Sample write that the use of a nuclear weapon is now more likely than any time since the cold war, but the probability of humanity being wiped out entirely has diminished.