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atomic clock. an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
The Doomsday Clock is a symbolic clock face, representing a countdown to possible global catastrophe (e.g. nuclear war or climate change). It has been maintained since 1947 by the members of the Science and Security Board of the Bulletin of the Atomic Scientists,[1] who are in turn advised by the Governing Board and the Board of Sponsors, including 18 Nobel Laureates.