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Re: The origin of flight: from the water up (still short!)
> P.S. You can't tell by looking, unless you have a cross-section of the
> and shaft walls.
Cross-sections of the shaft are available, as the shafts are preserved as
impressions. AFAIK they are round, and not bigger than normal (should have
written thicker instead of stronger). Cross-sections of the walls are of
course not available... making the whole affair partly untestable, I fear.