Chinese researchers have developed the world's smallest and most robust atomic clock that can survive the rigors of war.

World-record chaser Hilde Dosogne is used to running extreme distances. Still, she says she underestimated the challenge. She ...

Learn more› By Annie Chou Annie Chou is a writer focused on sleep. She has tested several sunrise alarm clocks, white noise machines, and other sleep-related gear. After a new round of testing ...