I GET several e-mails from 9/11 conspiracy theorists every week, usually typed in all capital letters with minimal punctuation and maximum sputter. Here's a typical message I received last Tuesday: "It appears you are not a believer. So, I have only one question, perhaps, but doubtfully, you can answer. WHY DID BUILDING SEVEN COME DOWN?"

As it happens, Popular Mechanics magazine's new book, "Debunking 9/11 Myths," answers that question concisely - with the caps key off. Among the unhinged fever swamps in academia and on the Internet, there is widespread suspicion that World Trade Center 7 collapsed as a result of a controlled demolition set by Secret Service and CIA agents who had offices there.

Reality check for the Twilight Zoners: Federal investigators and experts believe a combination of massive damage from falling debris plus raging fires led to a progressive collapse of WTC 7, causing structural failures that brought the building down.

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FIVE YEARS AFTER 9/11: TINFOIL HATS ATTACK By MICHELLE MALKIN - New York Post Online Edition: Postopinion