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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.
New Scientist

First quantum grandfather clock could probe where gravity comes from

Researchers have designed a quantum version of a pendulum clock. It could shed light on timekeeping in the quantum realm ...