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Protons
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
Rules
As long as protons are the lowest mass baryon, there is nothing for them to decay to (barring violation of baryon number conservation).
But surely with a higher mass, they'll be - to quote C3PO here - not entirely stable, with a new lower mass and that particle having another name.