To make a convincing zombie, it's all in the pacing. George Romero invented the modern zombie with his 1968 film, "Night of the Living Dead," and he still likes them old-fashioned - slow-moving but hard to stop. But Ruben Fleischer, director of the 2009 hit "Zombieland," is all for speeding up the undead. Romero's newest film, "Survival of the Dead," comes out later this month. Produced by Jonathan Mitchell.

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