>Our result is enabled by improving the fractional frequency measurement uncertainty by more than a factor of 10, now reaching 7.6 × 10−21. This is mindbogglin

>Our result is enabled by improving the fractional frequency measurement uncertainty by more than a factor of 10, now reaching 7.6 × 10−21. This is mindboggling. That timeframe is to one second roughly as a millisecond is to the estimated age of the universe.