Inconstant Light
...so say a team of Australian scientists who according to a WiredNews article, Was Einstein Wrong?, have proposed that the speed of light may not be a constant.
It's the nature of physics to change--Newtonian properties, quantum physics, waves, particles. Some of the explanations scientists claim, are elegant, but some of them are just plain messy and give us clear evidence that there is more to the universe than we have yet discovered.