Over the last 78 years, the clock’s time has changed according to how close scientists believe the human race is to total destruction. Some years the time changes, and some years it doesn’t.

and literacy groups—want schools to spend more time in the youngest grades teaching the sounds that make up words and the letters that represent those sounds. His petition is part of an enormous ...

“This is not a doomsday clock; the number is not zero. It’s telling us there is still time, but we can’t waste it,” Golan tells the Washington Post’s Jennifer Hassan. “The world is ...