Optical atomic clocks are our most precise tools to measure time and frequency 1–3 . Precision frequency comparisons between clocks in separate locations enable one to probe the space–time variation ...

Numerous organisms are equipped with circadian clocks (internal body clocks) that help them adapt to daily environmental changes in light and temperature. For synchronizing the clock phase (timing) ...

AI can spot when industrial clocks start lying, but it should never be trusted to become the clock’s final authority. A factory can forgive a late email. It won’t forgive a robot arm that arrives ...