Terrorist attempted to bring down Northwest Airlines flight from Amsterdam to Detroit. Suspect had explosive packet sewn into his underwear, tried to detonate it, but detonator malfunctioned. Security countermeasures seem intrusiveuntil something happens, author says. Low-tech security is usually best, the easiest, the least expensive countermeasure available. People have a short memory of recent attacks on airplanes, he says. “Why are terrorists focused on attacking airplanes?” asks the media and laypeople.”]