Listen to more stories on the Noa app. For six years, Vladimir Soldatov has been the custodian of Ukraine’s time. He oversees a laboratory in the city of Kharkiv that contains about a dozen clocks and ...

Jaq Prendergast does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

And because the speed of light is very, very large compared to everyday speeds, very small mistakes in the measurement of time get reflected into significant changes in distance. So if you make small ...