Atomic Clock

"There is a particular fact about the most precise atomic clocks currently in operation that the wider cultural register has, on the available evidence, not yet adequately absorbed."

https://spacedaily.com/d-the-most-accurate-atomic-clocks-in-operation-now-lose-less-than-one-second-every-30-billion-years-and-the-reason-this-matters-isnt-precision-for-its-own-sake-its-that-gravity-itself-slo/

Gravity and Time

"Few ideas in physics feel as intuitive, yet remain as puzzling, as time. In Einstein’s theory of relativity, time is not fixed. It changes depending on motion and gravity."https://scitechdaily.com/physicists-propose-strange-experiment-where-time-goes-quantum/