Assembling the explosives that blew out seven stories of the World Trade Center sounds so simple that it is easy to forget just how dangerous it is. First, go to any gardening center and chemical-supply house. For little more than $400, buy several 100-lb. bags of urea and some bottles of nitric and sulfuric acid. Mix the urea and acids into a thick paste, put the glop in plastic bags, then pack them in a cardboard box. Next attach either a blasting cap or a detonator made of some batteries, an alarm clock and a container of nitroglycerine. But be very,...
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