The most precise clocks in the world will lose only one second every 300 billion years—and someday they might fit in your ...

Scientists said they have been "amazed" by how precise the genetic clock is. The study adds to ... animals be in the right place at the right time. "Such fundamental mechanistic understanding ...

On Nov. 18, 1883, Americans adopted four standardized time zones, replacing a confusing, dangerous hodgepodge of times.

to pinpoint the precise laser frequency needed to trigger a nuclear transition and drive a nuclear clock. Nuclear clocks ...