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========== Most physical objects in everyday life maintain
the same identity whether we’re interactingwith them, or not.Like, a baseball is a baseball whether you're
holding it in your hand or it's flying throughthe air.Even electrons are electrons whether they're
part of an atom or flying freely through interstellarspace; they have the same mass, same charge:
they are electrons.But neutrinos, those weird, super light, super
fast, electrically neutral, hard-to-interact-withparticles - they are identity-agnostic.Neutrinos have different identities depending
on whether they’re interacting with otherparticles, or traveling freely, and on top
of that their identities can change over time!Here’s what I mean: when they interact with
other particles, like w...