And from Starbucks, I went down the rabbit hole. I found myself at a conference on Walker Street called 'How The World Changed After 9/11'. It was packed, but I managed to slide in at the back, to hear a guy called Webster Tarpley chant his own list of names. The names of the 46 military exercises and hijack drills (called things like 'Vigilant Guardian') that were actually taking place on the morning of September 11. "The greatest density of drills in US military history," Tarpley said.

Fake radar blips, dummy hijacks, dummy attacks, fighter jets sent off to Turkey, the skies left unprotected, with the FBI's top anti-terror experts stuck on a training exercise in California. The drills, said Tarpley, were important, because not only did they weaken and confuse US air defence, but there was also a military drill for each major component of the 9/11 attacks. The drills were cover, and the dummy threats were made real.

He drew attention to an extraordinary story, barely touched by the mainstream press, that Richard Clarke, who was the White House counter-terrorism czar at the time of the attacks, has recently accused the CIA of deliberately suppressing information before 9/11, information that might have prevented the attacks. Clarke claimed: "There was a high-level decision in the CIA ordering people not to share information." And who made this decision? "I would think it would have been made by the director".

We have to do something. Even if that something is simply to Google 'Cass Sunstein' and start from there. Begin your own cognitive infiltration. Google 'Vigilant Guardian' or 'Able Danger'. Crosscheck 'Abdel Hakim Belhadj' and 'Al-Qaida'. Begin digging. Begin thinking. And stop believing.