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Lawrence Krauss, co-chair of the Bulletin of Atomic Scientists Board of Sponsors poses with a graphic image of the "Doomsday Clock" a during a news conference,  Thursday, Jan. 14, 2010 in New York. The  Bulletin of Atomic Scientists adjusted the clock from 5 to 6 minutes before midnight. The clock tracks the threat of a global cataclysm. (AP Photo/Mary Altaffer)
Photo by: Mary Altaffer
Lawrence Krauss, co-chair of the Bulletin of Atomic Scientists Board of Sponsors poses with a graphic image of the "Doomsday Clock" a during a news conference, Thursday, Jan. 14, 2010 in New York. The Bulletin of Atomic Scientists adjusted the clock from 5 to 6 minutes before midnight. The clock tracks the threat of a global cataclysm. (AP Photo/Mary Altaffer)

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