The Doomsday clock was set at 89 seconds to midnight on Tuesday morning, putting it the closest the world has ever been to what scientists deem "global catastrophe." The decades-old international ...

Scientists said we haven't made enough progress addressing existential threats. Scientists and global leaders revealed on Tuesday that the "Doomsday Clock" has been reset to the closest humanity has ...

Which atomic clocks are best? The first time zone, Greenwich Mean Time, was established in the late 1600s to assist sailors before the invention of the train and railway in the mid-1800s expanded the ...