Re: The origin of flight: from the water up (still short!)

["David Marjanovic" <david.marjanovic@gmx.at>]

> P.S.  You can't tell by looking, unless you have a cross-section of the
shaft
> 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.