| − | The '''neutrino''' is ''"an elementary particle which holds no electrical charge, travels at nearly the speed of light, and passes through ordinary matter with virtually no interaction."'' [http://physics.about.com/od/glossary/g/neutrino.htm] | + | The '''neutrino''' is "an elementary particle which holds no electrical charge, travels at nearly the speed of light, and passes through ordinary matter with virtually no interaction."<ref>[http://physics.about.com/od/glossary/g/neutrino.htm About.com Physics: Neutrino]</ref> |