Talk:Just For Fun: Lots 'O Laughs & Brain Bogglers/@comment-207.165.13.221-20120410194914/@comment-207.165.13.221-20120410201137

Before neutrinos were found to oscillate, they were generally assumed to be massless, propagating at the speed of light. According to the Theory of Special Relativity, the question of neutrino velocity is closely related to their mass. If neutrinos are massless, they must travel at the speed of light. However, if they have mass, they cannot travel at the speed of light.