Here, here AZZURRI07, and thanks crankylandlord - you parallel the Discovery Channel special that gave the same explanation, which makes total sense.  Not to say that it's 100% guaranteed correct, BUT, it's sure 100 times better than bullshit conspiracy garbage. Even small brains should figure out that if somehow explosives were 'secretly' planted in the WTC, that they would have gone off on impact if they were near the impact floors (and if not, the explosion would be detected). Idiots...