Orac uncovers the real cause of the WTC tower collapses on 9/11

Over at Respectful Insolence, Orac has followed up a post about those who believe that the Towers were taken down by missiles disguised as planes by flying hologram generators with one in which he identifies the real cause of the building collapses--loose trains. The evidence is at least as compelling.

(But seriously, if you're curious about 9/11 conspiracy theories, read this, and check out the further sources at the bottom. Also check out Popular Science's book on the subject, and Skeptic magazine's vol. 12, no. 4 (2006) issue.)