How to Set the Doomsday Clock
It's two-and-a-half minutes to midnight. Do you know where your nuclear apocalypse is? The Bulletin of the Atomic Scientists does. Since 1947, the Bulletin has updated the hands of the clock to estimate the threat of human annihilation. The clock now sits closer to midnight than it has at any time since 1953, when the United States and the former Soviet Union detonated the first hydrogen bombs. But how do scientists actually calculate the time? Vox explains how the hands of the are moved.