The clock hands are set by the Bulletin of the Atomic Scientists, a group formed by Manhattan Project scientists at the University of Chicago who helped build the atomic bomb but protested using it ...

Even your Macbook or smartphone displays time which is synchronized to the NIST-F1 clock, a cesium fountain atomic clock ... clock of the entire United States. This official time was transmitted ...

His Rubidium-standard atomic real-time clock is surely an example of hardware ... For the circuit itself [Art] tells us he wanted to build something akin to the old HP nixie frequency counters ...

So steady are these oscillations that atomic clocks keep better time than the spinning earth itself The "pendulums" which regulate them are the vibrating parts of atoms or molecules.