The North Tower disappeared as rapidly as rubble falling through the air.
The Towers disappeared into exploding dust clouds
that first consumed their falling tops
and then consumed their remaining structures
from top to bottom in about 15 seconds
as they plummeted to ground.
Each Tower's dust cloud grew to several times the building's diameter
within a few seconds.
Thus the majority of each Tower's material was
falling freely through the air, outside the building's footprint.
Only air resistance slowed the descent of these materials,
accounting for about a 50 percent slowdown
compared to the rate of free-fall in a vacuum.
No portion of either tower remained standing
above the descending cloud.
At 8.5 seconds into its collapse the top of the
North Tower's cloud of dust and steel fragments
was falling at about 50 feet per second
both inside and outside the Tower's profile.
This proves that the falling rubble was not crushing the tower.
Air resistance slowed the descent of the rubble
outside the building's profile by about 50 percent.
And yet the over 1000 vertical feet of intact structure
did not slow portions falling within the profile
any more than air.
This can be verified by examining the top of the descending
dust cloud, which is essentially the same height both inside
and outside the profile of the North Tower.
Each Tower was supported by a lattice of 90,000 tons of steel
strong enough to resist earthquakes and hurricane-force winds.
To believe the Official Story requires one to think
that these immensely strong structures provided no more resistance
to falling rubble than did air.