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.

We normally think of atomic clocks as the gold standard in timekeeping. The very definition of a second — in modern times, at least — is 9,192,631,770 periods of the radiation corresponding to the ...

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

Comtoise watches, as seen here in the Comtoise Museum of master watchmaker Bernd Deckert, are a French pendulum clock from the French region of Franch-Comte. While they are beautiful antiques, they ...

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, ...

If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. If you like waking up the (semi) old-fashioned way with a ...

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 ...