SR Question (Basic)

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Basic SR question here. But Einstein said that the Speed of light is an absolute constant. Why then do we hear of experiments of laser light and some kind of substance used to SLOW light down to some ridiculously slow speeds? And how water slows down light too. Isn't that "violating" SR? If the Speed of Light is constant, then how can SR mean anything when something as simple as water can slow down light?

I'm sure there's a perfect explanation, I just don't know it :)
 
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