(Note that electron-flavored neutrinos are different from electrons; the latter are a different type of fundamental particle, with a negative charge.) The fact that neutrinos oscillate was proven by the physicists Takaaki Kajita and Arthur Bruce McDonald. In two separate experiments, they observed that electron-flavored neutrinos oscillate into mu- and tau-flavored neutrinos. If physicists had a better understanding of neutrino mass, this could help better describe the behavior and evolution of the universe. One of the main features of Juno, Ranucci explains, is that Juno can “see” both neutrinos and their antimatter counterpart: antineutrinos.