“In 1947, the specter of nuclear holocaust prompted the Bulletin of the Atomic Scientists to come up with a “Doomsday Clock.” The clock was meant to highlight just how close humans had come to wiping ourselves off the map. Midnight on the clock represented global catastrophe—the end of civilization as we know it.
Back then, the Bulletin set the clock to 11:53 p.m. The group has revisited the setting each year since, occasionally adjusting it forward or backward to reflect changes in world events.
On Thursday, it moved the clock forward two minutes, to 11:57 p.m.”