It’s funny — Bell’s inequality didn’t break physics so much as it broke our confidence in knowing what physics is.
Maybe that’s the real frontier: realizing that certainty itself is the variable. ⚛️🧠💫✨

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Yang and Mills were originally barking up the wrong tree when it came to the application of their idea, trying to implement it as a symmetry between protons and neutrons.
The application of their ideas to what we today call the standard model came more than 10 years later through Sheldon Glashow, and Steve Weinberg and Abdus Salam for the weak interactions; And then even later for the strong interactions via Gell-Mann, Zweig, Fritzsch

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Yang-Mills theory famously has the property that, unlike the photon in electrodynamics, it is forbidden for its bosons to possess any mass - it would be much easier to bestow mass upon the photon of electrodynamics via the Stückelberg mechanism (named after none other than Ernst Carl Gerlach Stückelberg von Breidenbach zu Breidenstein und Melsbach, unsung hero of quantum electrodynamics), but such shortcuts of generating mass are not possible in Yang-Mills-theory without seriously breaking things.

According to legend, this led to a historic clash between the Yang-Mills-team and acerbic father of quantum mechanics and pitiless axe of reason, Wolfgang Pauli, who let Yang-Mills-theory die from public humiliation after a talk by remarking that it predicts massless bosons which are clearly not present in nature.

What Wolfgang Pauli could not have known - the simplest and most elegant way to have masses for bosons in Yang-Mills-Theory, it turned out later, is the Higgs-mechanism, and the rest, as you know, is science history...

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