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New book explores fighting wars with cyber armies

Nicolas Armer /DPA/LANDOV

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The head of the National Security Agency made a grave announcement last week.

He believes China has the ability to take down the U.S. power grid via a cyber attack.

This steady drumbeat of threats to infrastructure and security has led to the development of so-called "cyber armies" in a number of countries, including the U.S.

Shane Harris explores this in his new book, "@ War: The Rise of the Military-Internet Complex."