The Doomsday Clock pictured at its setting of "90 seconds to midnight", last changed in January 2023 The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists.[1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and techno