NIST-F4: A Clock More Accurate Than the Age of Dinosaurs

NIST's new cesium fountain clock, NIST-F4, is one of the world's most accurate timekeepers. If it had been running since the dinosaurs roamed the Earth, it would be off by less than a second today. This breakthrough in atomic clock technology will help calibrate official US time and contribute to the global Coordinated Universal Time (UTC), ensuring accuracy in critical systems like finance, telecommunications, and transportation. The achievement solidifies NIST's leading role in precision timekeeping.