(Carolyn Kaster | The Associated Press) Robert Rosner, chairman of the Bulletin of the Atomic Scientists, right, and Bulletin of the Atomic Scientists member Lawrence Krauss, left, stand next to the Doomsday Clock after unveiling it during a news conference at the National Press Club in Washington, Thursday, Jan. 25, 2018., announcing that the Bulletin of the Atomic Scientists has moved the minute hand of the Doomsday Clock to two minutes to midnight.