What, you can't find Google yourself? Here's a
link.
Less than 15 seconds with Google:
http://wtc.nist.gov/pubs/factsheets/faqs_8_2006.htm. Look past the .gov in the URL for a second and just read it. All of your questions are addressed in reasonable, simple terms that don't require extraordinary leaps of faith, a massive (and perfect) conspiracy.
In any case, the fact that you're posing those questions here, and not carefully searching for better documented sources, suggests that you're not really interested in the truth ... just the entertainment value of parroting a tired, long-debunked theory.
All right, fair enough. I interpreted your defense of urge as agreement with his conclusions. Unwarranted.
Oooh, did someone give me moderator privileges and I didn't notice? Cool!
I'm not trying to suppress this silly debate. I'm mocking it. You're free to talk about 9/11 and our perfectly organized government's perfect coverup, or alien visits and another perfect government coverup, or anything else you like. And I'll point and laugh.
These very issues have been debated in exhaustive detail over and over and over again, for YEARS. There's no shortage of reasoned, well documented rebuttals to these conspiracy theories.
Hence my irritation and general disappointment that an anesthesiologist, a trained scientist who should be held to the highest standard of logic and evidence based practice, trots out the same garbage 9/11 arguments and "insightfully skeptical" questions that have been posed by the tinfoil brigade for close to 7 years now.
Read this if you get a chance:
http://www.time.com/time/magazine/article/0,9171,1531304,00.html
I understand why guys like urge are so eager to embrace conspiracy theories, but that doesn't make those theories believable or even worthy of (repeated) public debate. To (repeatedly) seriously debate things like this only lends those theories credence and respectability they don't deserve, and that is both dishonest and a disservice to the truth.
That is why I take time out of my weekend to mock conspiracy theory nutjobs.