Time Stands Still for Everything Except the Electrons

At attoseconds, that is,
According to physicists
Who just won the Nobel Prize.

Currently, zeptoseconds,
The strontium clock’s time scale,
Are the smallest time fragments

Human devices measure.
There’s an absolute limit,
Planck time, in which time stands still

For everything but photons
Moving one Planck length, also
According to physicists.

Past that, everything’s guesswork,
So let’s guess—divide units
Of Planck time, something will still

Change.