[Oberon]

I'd be more impressed with this conclusion if the scientists in question could tell me with some degree of certainty just what a photon is.

[gr8eman]

...it's a floor cleaner...No!...it's a dessert topping! I think a photon is a particle produced by an energy wave. If that's true, then the question becomes...Where is the photon produced? Do you see a particle that has travelled (like produced on the Sun) or do you just see the particle from the atoms surrounding your eyes?

Regarding time travel, I think these guys are off base and so was Einstein, a bit. How can a universal constant use a time division unique to only one planet in the universe?

[Moonman62]

I'd be more impressed with this conclusion if the scientists in question could tell me with some degree of certainty just what a photon is.

As the article says, it's an electromagnetic wave. Such waves depend on two other constants, permittivity, and permeability.

From Wiki:

This is the speed of light in vacuum. Maxwell's equations have unified the vacuum permittivity \epsilon_0, the vacuum permeability \mu_0, and the speed of light itself, c0.