The Doomsday Clock is a metaphor for how close the world is to being inhabitable for humanity. Scientists just set the new time for 2025.

The clock, set at seven minutes to midnight, appeared on the cover of its first issue in 1947. Albert Einstein and J. Robert Oppenheimer set up the Board of Sponsors in 1948 to help guide setting ...

He adjusts the mechanism on the clock’s four faces for the five daily prayers required by Islam. The time is set according to that day’s sunset, when its hand must be firmly on 12.