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Nearly 4000 American troops have died in the Iraq war, and now the Pentagon is calling robots to the rescue. Resident geek and robo whiz Erik Sofge offers the inside story of armed, unmanned vehicles coming soon to the battlefield. Plus, we talk online dating and love at first sight with top researcher Helen Fisher, teleporting and the next big moon flick with director Doug Liman, and the hustle and bustle of the Daytona 500 with Casey Mears's pit mechanic.