This is the mushroom cloud of the first atomic explosion at Trinity Test Site, N.M., on July 16, 1945. AP hide caption
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doomsday clock
Thursday
Thursday
The Bulletin of the Atomic Scientists announced during a news conference Thursday that its advisory group is moving the Doomsday Clock 30 seconds closer to midnight. Bulletin of the Atomic Scientists hide caption
Tuesday
The Doomsday Clock stayed fixed at three minutes to midnight — the closest it has been to midnight since 1984. Saul Loeb/AFP/Getty Images hide caption