‘100 Seconds To Midnight’: The Doomsday Clock, Explained In 7 Minutes

The Doomsday Clock reads 100 seconds to midnight, a decision made by The Bulletin of Atomic Scientists, during an announcement at the National Press Club in Washington, DC on January 23, 2020. - President and CEO of the non-profit group Rachel Bronson said "It is the closest to Doomsday we have ever been in the history of the Doomsday Clock." The clock was created in 1947. (Photo by EVA HAMBACH / AFP) (Photo by EVA HAMBACH/AFP via Getty Images)

On 23 January 2020, the doomsday clock was moved 100 seconds to midnight, signifying a symbolic move closer to global catastrophe.

What is the doomsday clock? How does it work? And what time has it displayed in its history?