A University of Birmingham scientist has built a "mini-universe" that takes a step toward answering one of science's biggest questions: "What is time?" Publishing his findings in Physical Review ...

First dreamed up decades ago, the world's first nuclear clocks are set to improve quickly, becoming more precise and aiding ...

Today, most people can check the time with a glance at a phone, watch, or computer screen. Precise timekeeping has become so routine that it's easy to forget how difficult it once was to measure the ...