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 world moved yet closer to global catastrophe in 2024, with the hands of the Doomsday Clock ticking one second closer to midnight, the shortest time to zero hour in its 75-year history.

Scientists move the Doomsday Clock to 89 seconds before midnight, calling on the U.S., China and Russia to address global risks.