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This weekend’s US clock change is a problem, and there’s a deep divide on how to fix it

Clocks will skip ahead an hour at 2 a.m. Sunday for daylight saving time in most of the U.S., creating a 23-hour day that throws off sleep schedules, plunges early-morning dog walks into darkness and ...

Using atomic nuclei could allow scientists to read time more precisely than ever – what this research could mean for future clocks

Most clocks, from wristwatches to the systems that run GPS and the internet, work by tracking regular, repeating motions. To build a clock, you need something that ticks in a perfectly repeatable way.