The strange science of 'time reflections' (msn.com) This is the first time its been confirmed, but its possible to bounce light off something fast enough to make it go backwards in time. Light has also proven to be intimately related to the polarization of a material, and what all that means is we're finally getting the first real idea of how light interacts normally with matter. This evidence implies light treats time as more isomorphic than material objects do, suggesting material objects have mass and more causality because we trade time for geometry. You could say, without light we wouldn't have time or the fundamental forces, and without matter they would be meaningless, while the two always come together.
