Could one bomb destroy the world?

How big a bang are arms manufacturers capable of creating?

- STEPHEN KELLY

There is a scene in Christopher Nolan’s new film Oppenheimer (a biopic of J Robert Oppenheimer, the man who invented the nuclear bomb) in which Leslie Groves, an army engineer played by Matt Damon, worries about destroying the world. This is just before the Trinity test, the first-ever detonation of an atomic bomb, and Oppenheimer says he’s confident that the chances of annihilating all life on Earth are near zero. “Near zero?” splutters Groves. “Zero would be nice!”