21106 | Most of the mass of a proton is the energy in virtual particles (rather than the quarks) [Krauss] |
21144 | Top, bottom, charm and strange quarks quickly decay into up and down [New Sci.] |
21138 | Neutrons are slightly heavier than protons, and decay into them by emitting an electron [New Sci.] |
21186 | Quarks rush wildly around in protons, restrained by the gluons [Hesketh] |