The best sunrise alarm clocks help you wake up gently and start your day energized. See our top picks from Hatch, Philips, ...

Atomic clocks are the basis upon which a second is defined. But there is a new kid on the block, the optical clock, which ...

Whether you prefer to set several alarms as an insurance measure, or want to share a clock with someone who wakes up at a different time than you, a clock with the ability to set multiple alarms ...

You can use different tools to measure time, such as a clock, a timer, or a stopwatch. Short activities are measured in seconds, such as how fast you can do five star jumps. Some activities take a ...

A revolutionary timekeeping breakthrough could be on the horizon as scientists explore the thorium-229 nuclear optical clock, an innovation that may surpass today’s atomic clocks. By manipulating ...