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[..]Department of Defense planners want to know when enemy troops are on the move, when vehicles are approaching or when other potentially hostile activity is unfolding. Existing sensors can regularly detect those movements, but those sensors often have limited battery life, constraining their usefulness and sometimes need to be changed as often as every three days. Researchers at the Defense Advanced Research Projects Agency (DARPA) say they are making headway on the problem. [..]

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