jim wrote:

i said the same thing several days ago and was lambasted by posters
here. the response 'that is flat out false' was directed my way. i saw
the same program as you. it was what made the wtc unique.

Other people said that because your statement is flat out false. What
is unique is the fact the outer structure doesn't provide gravitational
support as is found in most other skyscrapers. The weight is born
almost entirely on the central core. Whatever show you two watched was
either in error (doubtfull) or you misunderstood their description.

http://www.skyscraper.org/tallest/t_wtc.htm

Faced with the difficulties of building to unprecedented heights, the
engineers employed an innovative structural model: a rigid "hollow tube"
of closely spaced steel columns with floor trusses extended across to a
central core. The columns, finished with a silver-colored aluminum
alloy, were 18 3/4" wide and set only 22" apart, making the towers
appear from afar to have no windows at all.