You'd think that synchronizing the clocks across a fleet of modern servers is a solved problem, but it's actually quite a hard challenge to solve, especially if you want to get to nanosecond accuracy.

Perhaps your cell phone does a fine job waking you up in the morning, but an alarm clock is a superior device. By now, it’s common knowledge that using your phone at bedtime—or even sleeping near it, ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Picture a clock ...

If you start your day before the sun rises, or if you’re looking for a gentle alternative to a blaring alarm clock, a sunrise alarm clock may be your new favorite tool. These clocks mimic the natural ...