CMS Experiment CERN on X: "Quarks and electrons (and their siblings) are fundamental particles⚛️, meaning to our current best knowledge they cannot be split further. But what if we are wrong, and quarks are composite, so made of other undiscovered particles 🎊🎊? Read more: https://t.co/JcfOyP9rYT https://t.co/GwRIGJHpMZ" / X