I have a question about a finite mass neutrino. If it is so, then it takes over
as the smallest non-zero mass particle from the electron. When photons with
energies above twice the electron rest mass pass through matter, they create
electron/positron pairs. So if neutrinos of mass 0.07 eV exist why don't photons
of energy > 0.14 eV create neutrino/antineutrino pairs? (And how would optics
be different if they did?)