It turns out that the blockheads were right. The up, down and strange quarks were not just a mathematical mnemonic but seemed to be a physical reality. It was discovered that these three quarks weren’t enough to cover all the new particles, and eventually we’ve found ourselves with six quarks together with their antiparticles. In addition to the three Gell-Mann named, three more appeared on the scene: the charm quark, the top quark and the bottom quark.
