Two years after that day in September, the nation is still worried about terrorism. At the airports we're taking off our shoes, at work we're flashing our badges, and at home we're making sure the duct tape is where we can find it in the dark. But these rituals seem inadequate for coping with some truly terrifying scenarios: "dirty bombs" slipped into the country, a smallpox outbreak. Well, there's help on the way. A variety of companies and laboratories, some fostered by Washington, are rushing to produce technologies that address our deepest post-9/11 fears. Many will come on line in the...
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