If we assume, contrary to the traditional belief of physicists, that (1) a neutron is a bound system of proton + electron + anti-neutrino and (2) an atomic nucleus contains anti-neutrons instead of neutrons and (3) nuclear decay is caused by (rare) reactions of the form anti-neutron + neutrino (coming from the sun) --> neutron + anti-neutrino which takes place 'inside' the nucleus, and (4) the nucleus ejects the neutron and the anti-neutrino and thereby deacays, then one comes to the conclusion that the mystery of a huge matter-antimatter asymmetry does not exist at all, BECAUSE in heavy nuclei the number of protons is roughly equal to the number of anti-neutrons, and therefore, in an atom with a heavy nucleus the number of protons is roughly equal to the number of anti-protons and to the number of electrons and to the number of positrons. So the idea of a huge asymmetry between matter and antimatter would not be a real mystery, but a consequence of an inaccurate model of the structure of matter.