Scientists just discovered an entirely new way of measuring time

https://www.sciencealert.com/scientists-just-discovered-an-entirely-new-way-of-measuring-time

"don't have to start the clock – you just look at the interference structure and say: it's been 4 nanoseconds... By looking for the signature of interfering Rydberg states amid a sample of pump-probe atoms, technicians could observe a timestamp for events as fleeting as just 1.7 trillionths of a second. Future quantum watch experiments could replace the helium with other atoms, or even use laser pulse of different energies, to broaden the guide book of timestamps to suit a broader range of conditions"