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Then please, give us a link to those evidences. 

Isn't that the same concept you were questioning before? 

Which is exactly the same thing I said.  Light slows down in a denser medium. 

Fine structure constant?

Here is the link I gave.  Where does it say "fine structure constant"?

Why not give us some evidence of how observations of cosmic rays very far away shows that light speed may not be a constant?