Deep inside a mountain, a full day’s hike from any road, in a dry, deserted part of West Texas, a foundation funded by Jeff Bezos is building a clock that’s hundreds of feet tall. It’s been called the ...

Add Yahoo as a preferred source to see more of our stories on Google. The Bulletin of the Atomic Scientists members, from left, Jon B. Wolfsthal, Asha M. George and Steve Fetter reveal the Doomsday ...

At the dawn of the nuclear age, scientists created the Doomsday Clock as a symbolic representation of how close humanity is to destroying the world. On Tuesday, nearly eight decades later, the clock ...

Twenty years ago, over 140,000 Forbes readers participated in an unusual experiment designed to test the limits of long-distance communication: a letter from their own past. The experiment, called an ...