polaris93 pointed this remarkable series of reports to me ... they're from (of all things) the Popular Mechanics' site, and look at the actual science that refutes the various "conspiracy theories" around the 9/11 attacks. If you get sick of the foil-hat brigade's foam-at-the-mouth hysteria over their favorite lunatic blitherings, this is a good source for countering the insanity! Debunking The 9/11 Myths