Depends on personal position doesn't it? If you happened to be one of the terrorists on the day, then a few things went their way, fairly luckily. The discovery of the identites through passports was INCREDIBLY lucky.
Anyway, I meant that collapsing straight down was lucky in comparison to falling over.
1. Gravity is a downward force
2. The main structural strength of the WTC was near/at the outer walls.
Which of those do you dispute, and please give cites.
I don't. Though I'd describe gravity as an inward force myself... But for the purposes of a buillding, yeah down.
A plane hit one side of the building. meaning the structural strength in one side was compromised, then fire, continued to weaken the building. Shouldn't the top of the building toppled over, towards the damage?
I'll post some links for you next week. 'Real life' calls I'm afraid. I might get on over the weeked if work allows.