The 'Doomsday Clock' is now 85 seconds to midnight — the closest it's ever been. What scientists say this means for humanity and how the time is determined.

The clock is a symbolic way to show the public how close scientists believe the world is to a human-made apocalypse.
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How America built the doomsday planes to survive the nuclear war

Deep above the clouds flies the most secretive and vital fleet in America’s arsenal – the Doomsday planes. From the Cold ...