What is the difference between Weyl fermions and Weyl quasi-particles? Who is Weyl? In 1998, neutrinos was found wrong, neutrino oscillates, which means that neutrinos have a small mass. Weyl fermions, as a non-quality solution, having quality denies the properties of Weyl fermions. So far in the middle of the universe has not yet found the real basic particles of Weyl fermions. Therefore, people called it ghost particles. From the solid material, we found a quasi-particle, quasi-particles can b