History is the key to making sense of nuclear weapons

In the early days of his first term, US president Barack Obama gave a speech in Prague in which he called for a world without nuclear weapons. His argument was based on a risk assessment:

The varieties of nuclear strategy

During the Cold War, nuclear-weapons strategy was oriented around the doctrine of "mutual assured destruction": The world's two superpowers, the United States and the Soviet Union, both knew that any use of nuclear arms would ...

What Americans should fear in cyberspace

A recent Pew poll found that Americans are more afraid of a cyber attack than they are of Iranian nuclear weapons, the rise of China or climate change. Such fears are not only out of proportion to risk; if they take hold, ...

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