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How does light 'speed up'?
The speed of light is at it's highest in a vacuum. In earth's atmosphere it travels slightly slower. In certain crystals it slows down a lot. What I don't understand is when it has passed through the substance or passed through the earth's atmosphere, it speeds backup again. Once it is in a vacuum it returns to it's standard (approx. 100,000 Kps) speed. How does it do that?
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IS THAT IT ???!!!
Do you even know what 'it' is?
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