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Physicist David Goodstein, and astrophysicists Neil deGrasse Tyson and Roger Blandford briefly discuss the renewed interest in Einstein's cosmological constant, as well as recent evidence that the fine-structure constant might actually be changing. http://en.wikipedia.org/wiki/Cosmological_constant http://en.wikipedia.org/wiki/Fine-structure_constant The complete video of this discussion can be viewed here: http://www.researchchannel.org/prog/displayevent.aspx?rID=3807&fID=1688