Le_Forgeron wrote:
> It's all physic: eggs have an air volume inside, at one end.
> As the egg get older, the volume of the real-egg matter diminish a bit,
> leaving more room for air. Like a submarine, emptying the ballast
> (filling them with air) has a clear result: making float.
> 

The variation of internal volumes in the egg would not change the 
density... In order to change the density, at least one of two things 
must happen:
- matter going in or out
- overall volume changing

It seems to me that the shell of the eggs would prevent both, but then 
there might be some permeability or some room for shrinking/expanding.

-- 
Vincent

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