Artificial intelligence was not listed as a chief concern two years ago, the last time the Bulletin of the Atomic Scientists moved the clock closer to global catastrophe.

T he hands of the symbolic Doomsday Clock are set at 89 seconds to midnight - closer to global catastrophe than ever before. The Doomsday Clock, or the Nuclear War Clock, represen

The Bulletin of Atomic Scientists announced Tuesday that the "Doomsday Clock" is now set to 89 seconds to midnight.