Resembling a squat, wide fridge, the world's most accurate clock went on sale for $3.3 million in Japan on Wednesday. The "Aether clock OC 020" is so precise that it would take 10 billion years for it ...

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 ...

Earth is closer than ever to global catastrophe as major world powers grow increasingly confrontational and cooperative efforts to reduce existential risks break down, a group of scientists warned ...

Time zones are a complicated but necessary evil. Humans like the numbers on the clock to vaguely match up with what the sun is doing in the sky outside. To that end, different places in the world keep ...

Custodian Ray Keen inspects a clock face. A new study says world clocks will need a "negative leap second" to stay accurate. (Charlie Riedel/AP) ...