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  • NWA

    Morning Bell: The System Failed

    Pentaerythritol tetranitrate (PETN), the explosive Umar Farouk Abdulmutallab tried to detonate aboard Northwest Airlines flight 253, is among the most powerful of explosives in the world and was widely used to blow up airplanes in the 1970s and 1980s. The only reason the passengers of Flight 253 are still alive … More