From left, Rachel Bronson, executive director of Bulletin of the Atomic Scientists; Lawrence Krauss, chair of the Bulletin of Atomic Scientists; former ambassador Thomas R. Pickering; Sivan Kartha, and Sharon Squassoni, both members of Bulletin of the Atomic Scientists, sit after unveiling the 'Doomsday Clock' that remains at three minutes to midnight, Jan. 26, 2016, during a news conference at the National Press Club in Washington.

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