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SAN JOSE, Calif. – Hackers often harness the combined power of thousands of virus-infected personal computers to pump out spam e-mail or disable targeted servers by overwhelming them with Internet traffic. Now an Air Force colonel is suggesting the U.S. military build its own “botnet,” or network of remotely controlled …

NEW ORLEANS – Despite more than $22 million in repairs, a levee that broke with catastrophic effect during Hurricane Katrina is leaking again because of the mushy ground on which New Orleans was built, raising serious questions about the reliability of the city’s flood defenses. Outside engineering experts who have …

PHILADELPHIA – Hundreds of convicted criminals could be sprung from crowded city jails by fall and be placed in a “virtual lockdown” by being fitted with GPS tracking devices. A voice barking orders from their ankles would scold offenders who ventured someplace forbidden. That’s the vision of Deputy Mayor Everett …