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Replace dead link with another. I believe this is about the same phenomenon--the slowing of light due to vacuum polarization.
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|The speed of light varies.<ref>http://www.conservapedia.com/index.php?title=Essay:Quantifying_Openmindedness&oldid=147388</ref>
 
|The speed of light varies.<ref>http://www.conservapedia.com/index.php?title=Essay:Quantifying_Openmindedness&oldid=147388</ref>
 
|Physicists point out that the [[Theory of Relativity]] and [[Isaac Newton|Newtonian]] physics both demonstrate that the speed of light varies depending on the medium through which it is travelling.
 
|Physicists point out that the [[Theory of Relativity]] and [[Isaac Newton|Newtonian]] physics both demonstrate that the speed of light varies depending on the medium through which it is travelling.
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|"So it turns out the speed of light might not be constant after all." <ref>http://www.catholic.org/technology/story.php?id=50261</ref> Research shows that due to the impossibility of a perfect vacuum the idealized concept of 'the speed of light in a vacuum' cannot be achieved in practice.
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|"So it turns out the speed of light might not be constant after all." <ref>https://www.newscientist.com/article/dn6092-speed-of-light-may-have-changed-recently</ref> Research shows that due to the impossibility of a perfect vacuum the idealized concept of 'the speed of light in a vacuum' cannot be achieved in practice.
 
|March 25, 2013
 
|March 25, 2013
 
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|-
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