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

(koto_feja/Getty Images) A breakthrough in chronometry decades in the making could redefine the limits of how we keep time.

While not primarily useful for telling the time, nuclear clocks could allow scientists to test humankind's fundamental understanding of how reality works. Thorsten Schumm is a clockmaker, but not the ...