Since the measurement of time was created, the human being has done everything possible to build the most accurate mechanism possible to measure it. And so far it has been achieved with these clocks, the atominos or nuclear clocks, since they are the most precise ever built; with a delay of about 1 second every 300 billion years. They are called atomic because they use the vibration of atoms, among other things, to establish the duration of a unit of time. But let's not worry, for the vast majority of us, if not all of us, it is enough to use those watches that are sold in the corner store.