The decision to move or leave the clock alone is made by the bulletin’s science and security board including physicists and environmental scientists from around the world, after consultation with the bulletin’s Board of Sponsors, which includes 17 Nobel laureates. The clock was adjusted from five minutes-to-midnight to three minutes-to-midnight last year. It is expected now to consider tensions between the United States and Russia and the recent North Korean nuclear test. California Gov. Jerry Brown will join former U.S. Secretary of State George Shultz and former U.S. Secretary of Defense William Perry for a public discussion at Stanford University after the unveiling. The closest the clock has come to midnight was two minutes away in 1953, after hydrogen bomb was tested by the U.S. and the Soviet Union.