The history of the Doomsday Clock as it moves closer to ‘midnight’

Lawrence Krauss, theoretical physicist, chair of the Bulletin of the Atomic Scientists Board of Sponsors, left, and Thomas Pickering, co-chair of the International Crisis Group, display the Doomsday Clock in Washington, Thursday, Jan. 26, 2017. (AP Photo/Carolyn Kaster)

The December 1991 issue of …
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