David Plotz's "What You Think You Know About Sept. 11 …" in Slate is an interesting complement to the Philadelphia Daily News "20 Unanswered Questions" column I linked last night. The Slate column is way too agnostic on the subject of an Iraq link to 9/11 ("Saddam Hussein and al-Qaida share a pathological hatred of the United States, so it's entirely possible that they collaborated, even if we don't know how"), but otherwise it demonstrates that the relationship between accepted stories (e.g., that 9/11 plotters had plans to use crop-dusters) and reality is more tentative than we realize.