Good terrorist-nuke piece by William Langewiesche in the current Atlantic (you need a subscription).
If they could steal some “fissionables,” terrorists could put a nuke together “in some private machine shop perhaps no larger than a five-car garage,” says the writer.
How difficult would this be–the stealing, and the putting together? Langewiesche goes into the details very realistically, logging a lot of travel miles around Russia’s remote border areas. His answer is: very difficult. Bottom line: “In the end, if you wanted a bomb and calculated the odds, you would have to admit that they were stacked against you, simply because of how the world works–and that this may be why others like you, if there have been any, have so far not succeeded. You would understand, though, that the odds are not impossible.”