At 5:21 PM on 9/11, Building 7 of the World Trade Center collapsed,
even though it had not been hit by a plane
– a fact that is important because of the widespread acceptance of the idea,
in spite of its scientific absurdity,
that the Twin Towers collapsed because of the combined effect of the impact of the airliners plus the ensuing jet-fuel-fed fires.
The collapse of World Trade Center 7 (WTC 7) thereby challenges the official account of the destruction of the World Trade Center,
according to which it was accomplished by al-Qaeda hijackers,
even if one accepts the government’s scientifically impossible account of the Twin Towers.
The collapse of WTC 7 created an extraordinary problem for the official account of 9/11 for several reasons.