The Inverse Doppler effect: Researchers add to the bylaws of physics

What if the speed of light is a constant only most of the time? What if gravity sometimes pushed instead of pulled? Scientists are increasingly asking what would seem like far-out questions regarding the laws and rules of physics after discovering conditions and materials where the rules don't quite apply.
Take the Doppler effect.

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<p><a href="http://www.physorg.com/news4224.html">The Inverse Doppler effect: Researchers add to the bylaws of physics</a></p> <p>What if the speed of light is a constant only most of the time? What if gravity sometimes pushed instead of pulled? Scientists are increasingly asking what would seem like far-out questions regarding the laws and rules of physics after discovering conditions and materials where the rules don't quite apply. <br>Take the Doppler effect.</p>