New look at relativity: Electrons can’t exceed the speed of light — thanks to light itself, says biologist – A Cornell Biologist has suggested that it is the viscous nature of ever present protons that act as the limit for why Electrons can't exceed the speed of light.

As suggested in the paper, space is rarely, truly empty, but always contains some intensive structure that determines the capacities of the objects that inhabit it.

Much like how gravity forms the shape and contour of space-time, the Cornell biologist is suggesting that light forms a kind of viscous medium throughout that space.

Fascinating.