There is a new, super-accurate clock ticking away in National Laboratory for Atomic, Molecular and Optical Physics (KL FAMO) in Poland. Although, it’s not really ticking because this is an optical atomic clock, one of only a few in the world. It’s so accurate that it would take billions of years to reach an error of one second. To put it another way, if you started an optical atomic clock at the moment of the big bang, it would have lost about one-tenth of a second by now. Now that’s something you can set your watch by.