Today it is known that the atomic nuclei are composed of smaller constituents, the quarks. A quark is always bound with two other quarks, forming a baryon or with an antiquark, forming a meson. The quark model was first postulated in 1964 by Murray Gell-Mann -- who coined the name "quark" from James Joyce's novel Finnegans Wake -- and by George Zweig, who then worked at CERN. In the present theory of strong interactions -- Quantum Chromodynamics proposed...