This is a very nice post. Unfortunately, this time I have nothing to comment on. I find all explanations very clear and actually perfect. The only missing bits are probably the real experimentation part, which we obviously cannot do on Hive. Maybe one day in the metaverse? ;)

By the way, QED is really cool. Do you know that most precise QED calculations are related to anomalous magnetic dipole moments. We get a precision of better than one part in a trillion for what concerns the electron for instance! Moreover, both the anomalous magnetic moment of the electron and that of the muon are suspicious in terms of new phenomena...

Cheers!