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In terms of fundamental physics, the most basic things are
the fields and the excitations of the fields. Sometimes the
excitations look particle-like, sometimes they look wave-like,
rarely both, often neither.
I mention this because lately I’ve been getting questions
from several directions about “wave/particle duality”.
One could make a pretty strong argument that there’s no
such thing. The whole approach is a Bad Idea. It’s not
good technically, it’s not good pedagogically, it’s just
not worth the trouble. The smart approach is to focus on
the fields and the excitations in the fields, and not
even worry about what’s a particle and what’s not.