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Is An Electromagnetic Pulse Attack A Threat?

At Tuesday night's GOP presidential candidate debate, the last question was: What national security issue do you worry about that nobody is asking about? Answers ranged from socialist rebels to communist China to cyber attacks to joblessness. But Newt Gingrich mentioned a threat that certainly has not been talked about this campaign season: an electromagnetic pulse attack. Guy Raz talks with Noah Shachtman, who writes on national security for Wired magazine, about this potential national security threat.