[ExI] physical conservative

[scerir]

spike:
> What if the fine structure constant isn't constant?  It gives us an
> immediate motive to find ET life: we could ask them what is the fine
> structure constant in your neighborhood.  

New results seem to show alpha isn't so constant.
http://physicsworld.com/cws/article/news/43657
http://arxiv.org/abs/1008.3907

Read also the old Dirac here:
http://www.fdavidpeat.com/interviews/dirac.htm

and 
http://en.wikipedia.org/wiki/Dirac_large_numbers_hypothesis
http://arxiv.org/abs/0708.3518
http://arxiv.org/abs/0705.1836