Keeping time is easy, keeping precise time is hard, but a new type of clock based on atomic nuclei has pushed time-keeping ...

To a veteran horologist, "time is still a man-made invention." In his Pennsylvania workshop, he fixes its flaws. Horologist Theron "Jeff" Jeffery has been fixing clocks at his Ye Old Clock Shoppe in ...

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 ...