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World War Z is just the latest pop-culture incarnation of the Zombie Apocalypse. Adam Frank says the zombies keep coming because they're trying to tell us something. MPC/Paramount Pictures hide caption

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MPC/Paramount Pictures

A sea of self-motivated individuals or a web of interdependent talents? Both, of course. Jewel Samad/AFP/Getty Images hide caption

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Jewel Samad/AFP/Getty Images