Speed-of-light experiments yield baffling result at LHC

Energy-Mass equivalence. E=mc^2.

On-topic: I think this anomaly can be answered using general relativity. Anyone wanna give it a go? o.o

Massless particles have zero rest mass. Their relativistic mass is simply their relativistic energy, divided by c2, or m(relativistic) = E/c2.[7][8] The energy for photons is E = hf where h is Planck's constant and f is the photon frequency. This frequency and thus the relativistic energy are frame-dependent.

Wiki says your right, but it interacts with gravity, do neutrinos?

Neutrinos are just antielectrons, so I would say yes, they do have mass and thus gravitational interactions. My brain farted. Regardless, neutrino's mass is small but non-zero.

What's interesting is that they travel through matter unaffected.. Would this translate to any medium being the same as vacuum for them?