For nations at war, technology has always been an unsteady ally. Yes, the Great Wall kept China's marauders at bay, at least for a while, but all the weaponry America brought to bear on the Vietnamese--from napalm to the B-52s--couldn't win their hearts and minds. In our present war, we will rely more than ever on technology: the clever missiles that target a terrorist leader; the vaccines that protect against biological weapons; the lines of code that render a computer impervious to cyberterrorists. As the public debates whether it's safe to fly again, high-tech innovations promise to do everything from positively...
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