What is the Doomsday Clock? It's 2025 and scientists have reset the clock closer to midnight and global catastrophe. Here's what it all means.

The Doomsday Clock now stands at 89 seconds to midnight, the closest to catastrophe in its nearly eight-decade history. Here's a look at how — and why — it's moved.

In an announcement, the Bulletin of the Atomic Scientists moved the Doomsday Clock forward by one second to 89 seconds before midnight, the closest it has ever been to signaling a global catastrophe.