Australian scientists have proposed that the speed of light may not be a constant. The proposal is based on the discovery that “light from a distant quasar had absorbed the wrong type of photons from interstellar clouds on its 12 billion year journey to earth. This meant that the structure of atoms emitting quasar light was slightly but ever so significantly different to the structure of atoms in humans. The discrepancy could only be explained if either the electron charge, or the speed of light, had changed. But two of the cherished laws of the universe are the law that electron charge shall not change and that the speed of light shall not change, so whichever way you look at it we’re in trouble.”