Correction at 1100 EST, January 24: This article has been updated to clarify that the Bulletin of the Atomic Scientists has existed since 1945, but the Doomsday Clock has existed since 1947. 

The Bulletin of the Atomic Scientists, keeper of the infamous Doomsday Clock, delivered an ominous message to the world on Thursday: humanity is now closer than ever to wiping itself out, and at least some of the blame lies with North Korea and its nuclear weapons.

The symbolic clock’s new setting — just 100 seconds left until midnight, the group said — marks the closest the world has