Quote:
Originally Posted by Pio1980
Many "Facts" are facts in appropriate context, some are universal. The speed of light is taken as a constant, it's a universal value in relationship to a stationary point if there's agreement on that context. The speed of light in one direction measured from the aspect of light directed in the opposite direction makes for an interesting discussion concerning the absolute relative speed vs the theoretical context.
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But the speed of light slows down in water.
Is The Speed of Light Everywhere the Same?
I'm not trying to be argumentative, rather, I'm using that "fact" as a great example of how often facts we all take for granted are not even real facts. I find I get in the most trouble in both leftist centric and right wing centric sites when I start skewering "facts" everyone there is taking for granted. I get in trouble regarding the Ukraine, whether I be in left or right wing sites because I'm much less reticent to take a side, for virtually all of us on those sites only know what we're being told, and that depends on the reliability and veracity of our sources.