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Tornado sirens giving way to new warning technology

On April 10, 2011, tornadoes ripped across Wisconsin, tearing roofs off houses, toppling trees and snapping power lines. In many places, the high winds were greeted with silence as some Cold War-era warning sirens failed because of lost power and other issues — just when they were needed the most.

Opinion: GPS a privacy threat

Catherine Crump: Increasingly police are tracking our movements via our cell phones, an invasion that undermines our essential liberties

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