The clock has been used as a gauge of the perils facing humanity since its creation in 1947, moving backwards or forwards to indicate times of peace and peril respectively.
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The Doomsday Clock has moved two minutes closer to midnight to 11:55. The Bulletin of Atomic Scientists, who have maintained the clock since 1947 have moved it closer to signal the shifting concerns on global warming, the nuclear developments of Iran and Korea and the threat of a second nuclear age.