8. Cyber War, by Global Thinker No. 76 Richard Clarke and Robert Knake

From the man who famously warned about 9/11, a newly terrifying prognosis: that the United States isn't prepared for the greatest threat of the 21st century -- online war.

Cyber War: "The biggest secret in the world about cyber war may be that at the very same time the U.S. prepares for offensive cyber war, it is continuing policies that make it impossible to defend the nation effectively from cyber attack."

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