Hello, I'm still new to the world of physics... but I'm learning. I am reading a book that talks about the neutrino, and I understand the three neutrinos associated with the electron, muon, and tao particles. If the purpose of the neutrino is to conserve energy and mass when a particle decays, why does the electron have a neutrino? Isn't the electron supposed to be so fundamental that it does not decay into something else? Thanks!