IS LIGHT FASTER?

Some scientists are arguing that the speed of light (the c in E=mc2)isn't a constant at all, but instead is getting faster:

Scientists say the speed of light, regarded as a universal constant, may be getting faster.

They say it may have been lower as recently as two billion years ago - right here on Earth.

The controversial finding is based on re-analysis of old data that has long been used to argue exactly the opposite, reports New Scientist.

A varying speed of light contradicts Einstein's theory of relativity, and would undermine much of traditional physics.

But some physicists believe it would elegantly explain puzzling cosmological phenomena such as the nearly uniform temperature of the universe.

The only constant in science is that it's constantly changing.