How do people around the world keep time together? They use atomic clocks. These remarkable devices tap into frequencies hidden in the hearts of atoms to produce astoundingly stable, accurate ticks of time – far better than any other kind of clock. This animation explains why we use atoms to keep time and how they keep us all on the beat. | National Institute of Standards and Technology (NIST)

Atomic clocks have revolutionized how we navigate the globe and stay in sync across time zones. Now, optical atomic clocks are pushing the boundaries even further — achieving mind-bending levels of precision. With the power to redefine the very concept of a “second,” these cutting-edge innovations are transforming navigation, data transmission, and our understanding of space-time itself. Could this unprecedented accuracy in measuring time be the key to unlocking the deepest secrets of the univer